10. Output devices¶
Research¶
Useful links being shared during the Global Session by other instructors¶
- Introduced Video
- Miriam’s Final Project
- Real-Time 3D Room Mapping With ESP32, VL53L5CX Sensor And IMU
- Input Devices by Saheen
- Turn Codes into Things: Kokopelli and Antimony
- FoldScope
- I see sensors
- The three methods Leeuwenhoek used to make his lenses: grinding, blowing, and drawing.
- Skycraftsurplus
- Almost any voltage with QC
- The Surprising Flaws in 18650 Lithium-Ion Batteries
- The Lumafield Battery Quality Report
- Garden work
- Tazer Camera Makes Me The Tallest Person in The Picture
- Skycraft blend
- Speaker
- Speaker
- Sirialport Voice module
- Fab Speaker Bestial
- Novelty Synth from Recycled Vape
- Toothless Dance Meme (Driftveil City) but its played on 32 Stepper Motors
Group Assignment:¶
Individual Assignment¶
-
Add an output device to a microcontroller board you’ve designed and program it to do something.¶
For my Output week 1st spiral, I modified my latest circuit to be able to connect Servo motors as the output.
Previous circuit was as follows;
Copy the previous KiCAD folder in Windows explore.
Change the folder name into “KICad_Servo_Out”.
Change following three files name as same name as the new folder name.
Changing three files’ name as new folder name.
Confirm if the “Update PCB” functions.
Check the Pin order of normal Servo Motor.
Added 2pin flat connector for outside 5V power.
Added 4pin flat connector for RX TX communication week following my instructor Kae’s suggestion.
Added Diode Shottky for outside 5V power.
Schematics for the two Servo Output circuit
Checked “Run DRC” as no error
Measured actual Potentiometer size as follows;
B10K Potentiometer measurement size
Outside Diameter of cylinder 16.5mm
Pin Pitch 5.0mm
B10K Potentiometer measurement size
Outside Diameter of cylinder 16.5mm
Pin Pitch 5.0mm
Since the potentiometer pin position is higher than the cylindrical part at the bottom, I decided to make a hole for cylindrical part for soldering fixation.
Make a hole with the center from the center pin at the distance of 13.25mm
16.5/2 + 5 (pin distance from case edge) = 13.25mm
With above measurement result, I designed additional part in my previous Development Board.
Mention actual Potentiometer size into PCB drawing
KiCAD PCB with pin description
Here under is the KICAD PCB circuit drawing
Zone Setting
Check “Design RUles” if there is no error.
Plotting the circuit
Plot SVG files were made.
F_Cu cut SVG file
B_Cu cut SVG file
Edge_Cut SVG file
Make PNG files by adjusting the path thickness in InkScape.
F_Cu PNG file
B_Cu PNG file
Edge_Cut PNG file
Open “Mods Project” and “Select F_Cu PNG file”.
Since “Mods” will make cut path with the “Black Color” part, it is necessary to invert the path.
Invert “F_Cu PNG file” to invert the path color.
Select 1/64 inch flat
Set 0, 0, 0, for the “move to origin” part, and switch ON for both switches.
After Calculation, you see the cutting simulation as follows;
Select initial “B_Cu PNG file” and found that the circle cut for potentiometer was not drown.
Modified the color setting to achieve the circle can be seen as white line style.
Export as a PNG file
Open the modified file with “Mods” again.
Invert it
Select 1/32 cut out for cutting hole mill setting
Set 0, 0, 0, for the “move to origin” part, and switch ON for both switches.
After Calculation, you see the cutting simulation as follows;
calculation result
Make edge cut out like wider than the hatched square.
Make Edge Cut file as follows and export as a PNG file.
Select Edge_Cut PNG file by “Mods”.
Invert it and check if the Edge Cut line can be seen.
Select 1/32 Cutout for Edge Cut milling.
Set 0, 0, 0, for the “move to origin” part, and switch ON for both switches.
After Calculation, you see the cutting simulation as follows;
Set new board for PCB milling.
Milling PCB with SRM20
Board milling result
Milled Board
Checked with Multimeter if all paths are electrically connected.
Prepare for soldering
Soldering done
Arduino Code for Analog input and output test with potentiometer¶
int anavalue;
void setup() {
// put your main code here, to run repeatedly:
pinMode(A2,INPUT);
// put your setup code here, to run once:
Serial.begin(115200);
}
void loop() {
// put your main code here, to run repeatedly:
anavalue = analogRead(A2);
Serial.print("input value:");
Serial.println(anavalue);
delay(100);
}
I checked the input signal is read in plotter.
Then I made the following code by referencing the Book “Prototyping Lab by Shigeru Kobayashi” page 217.
#include <Servo.h>
int anavalue;
Servo servo;
void setup() {
// put your main code here, to run repeatedly:
pinMode(A2,INPUT);
// set servo signal pin as D9:
servo.attach(D9);
// put your setup code here, to run once:
Serial.begin(115200);
}
void loop() {
// put your main code here, to run repeatedly:
anavalue = analogRead(A2);
// scaling the input value from 0 to 180:
int angle = map(value, 0, 4095, 0, 180);
// set servo angle:
servo.write(angle);
Serial.print("input value:");
Serial.println(anavalue);
delay(100);
}
I had following error by Arduino IDE;
WARNING: library Servo claims to run on avr, megaavr, sam, samd, nrf52, stm32f4, mbed, mbed_nano, mbed_portenta, mbed_rp2040, renesas, renesas_portenta, renesas_uno architecture(s) and may be incompatible with your current board which runs on esp32 architecture(s).
In file included from C:\Users\kohsh\OneDrive\Documents\Arduino\Potentiometer_test\Potentiometer_test.ino:1:
C:\Users\kohsh\AppData\Local\Arduino15\libraries\Servo\src/Servo.h:81:2: error: #error "This library only supports boards with an AVR, SAM, SAMD, NRF52, STM32F4, Renesas or XMC processor."
81 | #error "This library only supports boards with an AVR, SAM, SAMD, NRF52, STM32F4, Renesas or XMC processor."
| ^~~~~
exit status 1
Compilation error: exit status 1
It seems I have to download and install the Servo library for XIAO-ESP32C3.
Here under are several method to install Servo library into Arduino IDE.
* How to install Servo Library in Arduino IDE
Reading above information, I decided to follow Dlloydev/ESP32-ESP32S2-AnalogWrite
Search XIAO-ESP32 Servo Library from Arduino IDE Sketch though “Manage Libraries”.
Install “ESP32-ESP32S2-AnalogWrite” Library into IDE.
Downloading the library into IDE
The library installation page explains to set following code at the beginning of IDE programming.
Then I modified my code as follows;
#include <Servo.h>
// Servo myservo = Servo();
Servo myservo;
int anavalue;
// Servo servo;
void setup() {
// put your main code here, to run repeatedly:
pinMode(A2,INPUT);
// set servo signal pin as D9:
myservo.attach(D9);
// put your setup code here, to run once:
Serial.begin(115200);
}
void loop() {
// put your main code here, to run repeatedly:
anavalue = analogRead(A2);
// scaling the input value from 0 to 180:
int angle = map(anavalue, 0, 4095, 0, 180);
// set servo angle:
myservo.write(D9, angle);
Serial.print("input value:");
Serial.println(anavalue);
delay(100);
}
Then got following error by Arduino IDE.
c:\Users\kohsh\OneDrive\Documents\Arduino\libraries\ESP32_ESP32S2_AnalogWrite\src\pwmWrite.cpp: In member function 'uint8_t Pwm::attach(int)':
c:\Users\kohsh\OneDrive\Documents\Arduino\libraries\ESP32_ESP32S2_AnalogWrite\src\pwmWrite.cpp:55:9: error: 'ledcSetup' was not declared in this scope; did you mean 'ledc_stop'?
55 | ledcSetup(ch, mem[ch].frequency, mem[ch].resolution);
| ^~~~~
| ledc_stop
c:\Users\kohsh\OneDrive\Documents\Arduino\libraries\ESP32_ESP32S2_AnalogWrite\src\pwmWrite.cpp:57:9: error: 'ledcAttachPin' was not declared in this scope; did you mean 'ledcAttach'?
57 | ledcAttachPin(pin, ch);
| ^~~~~
| ledcAttach
c:\Users\kohsh\OneDrive\Documents\Arduino\libraries\ESP32_ESP32S2_AnalogWrite\src\pwmWrite.cpp: In member function 'uint8_t Pwm::attach(int, int)':
c:\Users\kohsh\OneDrive\Documents\Arduino\libraries\ESP32_ESP32S2_AnalogWrite\src\pwmWrite.cpp:68:5: error: 'ledcSetup' was not declared in this scope; did you mean 'ledc_stop'?
68 | ledcSetup(ch, mem[ch].frequency, mem[ch].resolution);
| ^~~~~
| ledc_stop
c:\Users\kohsh\OneDrive\Documents\Arduino\libraries\ESP32_ESP32S2_AnalogWrite\src\pwmWrite.cpp:70:5: error: 'ledcAttachPin' was not declared in this scope; did you mean 'ledcAttach'?
70 | ledcAttachPin(pin, ch);
| ^~~~~
| ledcAttach
c:\Users\kohsh\OneDrive\Documents\Arduino\libraries\ESP32_ESP32S2_AnalogWrite\src\pwmWrite.cpp: In member function 'uint8_t Pwm::attachInvert(int)':
c:\Users\kohsh\OneDrive\Documents\Arduino\libraries\ESP32_ESP32S2_AnalogWrite\src\pwmWrite.cpp:78:3: error: 'ledcSetup' was not declared in this scope; did you mean 'ledc_stop'?
78 | ledcSetup(ch, mem[ch].frequency, mem[ch].resolution);
| ^~~~~
| ledc_stop
c:\Users\kohsh\OneDrive\Documents\Arduino\libraries\ESP32_ESP32S2_AnalogWrite\src\pwmWrite.cpp: In member function 'uint8_t Pwm::attachInvert(int, int)':
c:\Users\kohsh\OneDrive\Documents\Arduino\libraries\ESP32_ESP32S2_AnalogWrite\src\pwmWrite.cpp:87:5: error: 'ledcSetup' was not declared in this scope; did you mean 'ledc_stop'?
87 | ledcSetup(ch, mem[ch].frequency, mem[ch].resolution);
| ^~~~~
| ledc_stop
c:\Users\kohsh\OneDrive\Documents\Arduino\libraries\ESP32_ESP32S2_AnalogWrite\src\pwmWrite.cpp: In member function 'float Pwm::writeServo(int, float)':
c:\Users\kohsh\OneDrive\Documents\Arduino\libraries\ESP32_ESP32S2_AnalogWrite\src\pwmWrite.cpp:180:9: error: 'ledcSetup' was not declared in this scope; did you mean 'ledc_stop'?
180 | ledcSetup(ch, mem[ch].frequency, mem[ch].resolution);
| ^~~~~
| ledc_stop
c:\Users\kohsh\OneDrive\Documents\Arduino\libraries\ESP32_ESP32S2_AnalogWrite\src\pwmWrite.cpp:182:9: error: 'ledcAttachPin' was not declared in this scope; did you mean 'ledcAttach'?
182 | ledcAttachPin(pin, ch);
| ^~~~~
| ledcAttach
c:\Users\kohsh\OneDrive\Documents\Arduino\libraries\ESP32_ESP32S2_AnalogWrite\src\pwmWrite.cpp: In member function 'void Pwm::detach(int)':
c:\Users\kohsh\OneDrive\Documents\Arduino\libraries\ESP32_ESP32S2_AnalogWrite\src\pwmWrite.cpp:253:5: error: 'ledcDetachPin' was not declared in this scope; did you mean 'ledcDetach'?
253 | ledcDetachPin(mem[ch].pin); // jitterless
| ^~~~~
| ledcDetach
In file included from C:\Users\kohsh\AppData\Local\Arduino15\packages\esp32\tools\esp32c3-libs\3.3.7/include/soc/esp32c3/register/soc/interrupt_core0_reg.h:13,
from C:\Users\kohsh\AppData\Local\Arduino15\packages\esp32\tools\esp32c3-libs\3.3.7/include/soc/esp32c3/include/soc/interrupt_reg.h:8,
from C:\Users\kohsh\AppData\Local\Arduino15\packages\esp32\tools\esp32c3-libs\3.3.7/include/riscv/include/riscv/rv_utils.h:12,
from C:\Users\kohsh\AppData\Local\Arduino15\packages\esp32\tools\esp32c3-libs\3.3.7/include/esp_hw_support/include/esp_cpu.h:19,
from C:\Users\kohsh\AppData\Local\Arduino15\packages\esp32\tools\esp32c3-libs\3.3.7/include/esp_hw_support/include/spinlock.h:11,
from C:\Users\kohsh\AppData\Local\Arduino15\packages\esp32\tools\esp32c3-libs\3.3.7/include/freertos/FreeRTOS-Kernel/portable/riscv/include/freertos/portmacro.h:65,
from C:\Users\kohsh\AppData\Local\Arduino15\packages\esp32\tools\esp32c3-libs\3.3.7/include/freertos/FreeRTOS-Kernel/include/freertos/portable.h:57,
from C:\Users\kohsh\AppData\Local\Arduino15\packages\esp32\tools\esp32c3-libs\3.3.7/include/freertos/FreeRTOS-Kernel/include/freertos/FreeRTOS.h:69,
from C:\Users\kohsh\AppData\Local\Arduino15\packages\esp32\hardware\esp32\3.3.7\cores\esp32/Arduino.h:33,
from c:\Users\kohsh\OneDrive\Documents\Arduino\libraries\ESP32_ESP32S2_AnalogWrite\src\pwmWrite.cpp:7:
c:\Users\kohsh\OneDrive\Documents\Arduino\libraries\ESP32_ESP32S2_AnalogWrite\src\pwmWrite.cpp:254:19: error: 'GPIO_PIN_MUX_REG' was not declared in this scope; did you mean 'GPIO_PIN19_REG'?
254 | REG_SET_FIELD(GPIO_PIN_MUX_REG[pin], MCU_SEL, GPIO_MODE_DEF_DISABLE);
| ^~~~~~
C:\Users\kohsh\AppData\Local\Arduino15\packages\esp32\tools\esp32c3-libs\3.3.7/include/soc/esp32c3/include/soc/soc.h:37:37: note: in definition of macro 'REG_WRITE'
37 | (*(volatile uint32_t *)(_r)) = (_v); \
| ^~
c:\Users\kohsh\OneDrive\Documents\Arduino\libraries\ESP32_ESP32S2_AnalogWrite\src\pwmWrite.cpp:254:5: note: in expansion of macro 'REG_SET_FIELD'
254 | REG_SET_FIELD(GPIO_PIN_MUX_REG[pin], MCU_SEL, GPIO_MODE_DEF_DISABLE);
| ^~~~~
C:\Users\kohsh\AppData\Local\Arduino15\packages\esp32\tools\esp32c3-libs\3.3.7/include/soc/esp32c3/include/soc/soc.h:72:43: error: invalid operands of types 'void' and 'int' to binary 'operator&'
72 | REG_WRITE((_r),((REG_READ(_r) & ~((_f##_V) << (_f##_S)))|(((_v) & (_f##_V))<<(_f##_S)))); \
| ^ ~~~~~~~~~
| |
| int
C:\Users\kohsh\AppData\Local\Arduino15\packages\esp32\tools\esp32c3-libs\3.3.7/include/soc/esp32c3/include/soc/soc.h:37:45: note: in definition of macro 'REG_WRITE'
37 | (*(volatile uint32_t *)(_r)) = (_v); \
| ^~
c:\Users\kohsh\OneDrive\Documents\Arduino\libraries\ESP32_ESP32S2_AnalogWrite\src\pwmWrite.cpp:254:5: note: in expansion of macro 'REG_SET_FIELD'
254 | REG_SET_FIELD(GPIO_PIN_MUX_REG[pin], MCU_SEL, GPIO_MODE_DEF_DISABLE);
| ^~~~~
c:\Users\kohsh\OneDrive\Documents\Arduino\libraries\ESP32_ESP32S2_AnalogWrite\src\pwmWrite.cpp: In member function 'bool Pwm::detached(int)':
c:\Users\kohsh\OneDrive\Documents\Arduino\libraries\ESP32_ESP32S2_AnalogWrite\src\pwmWrite.cpp:259:22: error: 'GPIO_PIN_MUX_REG' was not declared in this scope; did you mean 'GPIO_PIN19_REG'?
259 | if ((REG_GET_FIELD(GPIO_PIN_MUX_REG[pin], MCU_SEL)) == 0) return true;
| ^~~~~~
C:\Users\kohsh\AppData\Local\Arduino15\packages\esp32\tools\esp32c3-libs\3.3.7/include/soc/esp32c3/include/soc/soc.h:42:37: note: in definition of macro 'REG_READ'
42 | (*(volatile uint32_t *)(_r)); \
| ^~
c:\Users\kohsh\OneDrive\Documents\Arduino\libraries\ESP32_ESP32S2_AnalogWrite\src\pwmWrite.cpp:259:8: note: in expansion of macro 'REG_GET_FIELD'
259 | if ((REG_GET_FIELD(GPIO_PIN_MUX_REG[pin], MCU_SEL)) == 0) return true;
| ^~~~~
C:\Users\kohsh\AppData\Local\Arduino15\packages\esp32\tools\esp32c3-libs\3.3.7/include/soc/esp32c3/include/soc/soc.h:67:28: error: invalid operands of types 'void' and 'int' to binary 'operator>>'
67 | ((REG_READ(_r) >> (_f##_S)) & (_f##_V)); \
| ^~ ~~~~
c:\Users\kohsh\OneDrive\Documents\Arduino\libraries\ESP32_ESP32S2_AnalogWrite\src\pwmWrite.cpp:259:8: note: in expansion of macro 'REG_GET_FIELD'
259 | if ((REG_GET_FIELD(GPIO_PIN_MUX_REG[pin], MCU_SEL)) == 0) return true;
| ^~~~~
c:\Users\kohsh\OneDrive\Documents\Arduino\libraries\ESP32_ESP32S2_AnalogWrite\src\pwmWrite.cpp:259:55: error: invalid operands of types 'void' and 'int' to binary 'operator=='
259 | if ((REG_GET_FIELD(GPIO_PIN_MUX_REG[pin], MCU_SEL)) == 0) return true;
| ~~~~~~~~~~~~~~~~ ^ ~
| |
| int
c:\Users\kohsh\OneDrive\Documents\Arduino\libraries\ESP32_ESP32S2_AnalogWrite\src\pwmWrite.cpp: In member function 'float Pwm::setFrequency(int, uint32_t)':
c:\Users\kohsh\OneDrive\Documents\Arduino\libraries\ESP32_ESP32S2_AnalogWrite\src\pwmWrite.cpp:283:7: error: 'ledcSetup' was not declared in this scope; did you mean 'ledc_stop'?
283 | ledcSetup(ch, frequency, mem[ch].resolution);
| ^~~~~
| ledc_stop
c:\Users\kohsh\OneDrive\Documents\Arduino\libraries\ESP32_ESP32S2_AnalogWrite\src\pwmWrite.cpp: In member function 'uint8_t Pwm::setResolution(int, uint8_t)':
c:\Users\kohsh\OneDrive\Documents\Arduino\libraries\ESP32_ESP32S2_AnalogWrite\src\pwmWrite.cpp:297:7: error: 'ledcSetup' was not declared in this scope; did you mean 'ledc_stop'?
297 | ledcSetup(ch, mem[ch].frequency, resolution);
| ^~~~~
| ledc_stop
c:\Users\kohsh\OneDrive\Documents\Arduino\libraries\ESP32_ESP32S2_AnalogWrite\src\pwmWrite.cpp: In member function 'void Pwm::wr_servo(int, float, double, double)':
c:\Users\kohsh\OneDrive\Documents\Arduino\libraries\ESP32_ESP32S2_AnalogWrite\src\pwmWrite.cpp:376:9: error: 'ledcSetup' was not declared in this scope; did you mean 'ledc_stop'?
376 | ledcSetup(ch, mem[ch].frequency, mem[ch].resolution);
| ^~~~~
| ledc_stop
c:\Users\kohsh\OneDrive\Documents\Arduino\libraries\ESP32_ESP32S2_AnalogWrite\src\pwmWrite.cpp:378:9: error: 'ledcAttachPin' was not declared in this scope; did you mean 'ledcAttach'?
378 | ledcAttachPin(pin, ch);
| ^~~~~
| ledcAttach
c:\Users\kohsh\OneDrive\Documents\Arduino\libraries\ESP32_ESP32S2_AnalogWrite\src\pwmWrite.cpp: In member function 'void Pwm::wr_freq_res(int, uint32_t, uint8_t)':
c:\Users\kohsh\OneDrive\Documents\Arduino\libraries\ESP32_ESP32S2_AnalogWrite\src\pwmWrite.cpp:451:5: error: 'ledcSetup' was not declared in this scope; did you mean 'ledc_stop'?
451 | ledcSetup(ch, frequency, resolution);
| ^~~~~
| ledc_stop
Multiple libraries were found for "Servo.h"
Used: C:\Users\kohsh\OneDrive\Documents\Arduino\libraries\ESP32_ESP32S2_AnalogWrite
Not used: C:\Users\kohsh\AppData\Local\Arduino15\libraries\Servo
exit status 1
Compilation error: exit status 1
I modified several part and confirmed several times and came to following coding which still have few errors.
#include <Servo.h>
Servo myservo = Servo();
// Servo myservo;
int anavalue;
// Servo servo;
void setup() {
// put your main code here, to run repeatedly:
pinMode(A2,INPUT);
// set servo signal pin as D9:
myservo.attach(D9);
// put your setup code here, to run once:
Serial.begin(115200);
}
void loop() {
// put your main code here, to run repeatedly:
anavalue = analogRead(A2);
// scaling the input value from 0 to 180:
int angle = map(anavalue, 0, 4095, 0, 180);
// set servo angle:
myservo.write(D9, angle);
Serial.print("input value:");
Serial.println(anavalue);
delay(100);
}
Then I decided to ask Copliot with following prompt;
Would you check what it wrong with following code for Arduino IDE?
------------copied above mentioned coding-------------
Got following advice by Copilot;
On ESP32 family boards, including ESP32‑C3, the classic Servo.h can be problematic depending on core/library versions. The commonly recommended approach is using ESP32Servo for stable PWM servo control on ESP32 boards. [docs.arduino.cc], [github.com]
So I recommend switching to:
#include <ESP32Servo.h>
Then I decided to change the librarry from “ESP32-ESP32S2-AnalogWrite” to “ESP32Servo(by Kevin Harrington, John K.Bennett)”.
I copied the modified coding by Copilot as a trial.
#include <ESP32Servo.h>
Servo myservo;
int anavalue;
const int POT_PIN = A2;
const int SERVO_PIN = D9; // If upload gets unstable, change to D8 [3](https://lab.seeed.co.jp/entry/2023/04/03/120000)[4](https://qiita.com/ginger/items/476012a24c6b30121606)
void setup() {
Serial.begin(115200);
// analogRead works without pinMode, but it's okay to keep it
pinMode(POT_PIN, INPUT);
// SG90 typical pulse range
myservo.setPeriodHertz(50);
myservo.attach(SERVO_PIN, 500, 2400);
}
void loop() {
anavalue = analogRead(POT_PIN); // 0..4095 typical
int angle = map(anavalue, 0, 4095, 0, 180);
angle = constrain(angle, 0, 180);
myservo.write(angle); // <-- Correct usage
Serial.print("input value: ");
Serial.print(anavalue);
Serial.print(" angle: ");
Serial.println(angle);
delay(20); // 20ms is a nice servo update interval
}
It worked with my Development Board.
Then I modified a bit about potentiometer opertion angle to make it less angle operation to drive the servo full angle (180deg).
I was instructed by Saheen and Rico at the Agian Session to avoid using the connection cable from Servo input socket to the PCB Pin. This can cause additional noise into the Servo control might makes potential vibration or noise sound at operarion.¶
I should have designed to use male pin for servo connector on the PCB Board.
void loop() {
anavalue = analogRead(POT_PIN); // 0..4095 typical
// int angle = map(anavalue, 0, 4095, 0, 180);
int angle = map(anavalue, 0, 2048, 0, 180);
angle = constrain(angle, 0, 180);
Since my final project system needs two motors for cancelling unnecessary direction torque, I made a program for two motors being controlled by one potentiometer rotating with opposite phase.
// Reference Library
#include <ESP32Servo.h>
// Set two Servo motors
Servo servo1;
Servo servo2;
// Set each signal for each PIN
const int POT_PIN = A2;
const int SERVO_PIN_1 = D9;
const int SERVO_PIN_2 = D8;
// Set Potentiometer value
int anavalue = 0;
void setup() {
Serial.begin(115200);
// optional for ADC
pinMode(POT_PIN, INPUT);
// 50Hz is the standard servo refresh rate
servo1.setPeriodHertz(50);
servo2.setPeriodHertz(50);
// SG90 typical pulse range
servo1.attach(SERVO_PIN_1, 500, 2400);
servo2.attach(SERVO_PIN_2, 500, 2400);
}
void loop() {
anavalue = analogRead(POT_PIN); // typically 0..4095 on ESP32 ADC
anavalue = constrain(anavalue, 0, 4095);
// Map Potentiometer value -> angles
int angle1 = map(anavalue, 0, 2048, 0, 180); // normal phase
int angle2 = 180 - angle1; // opposite phase
// Safety clamp for Potentiometer
angle1 = constrain(angle1, 0, 180);
angle2 = constrain(angle2, 0, 180);
// Drive two servo motors
servo1.write(angle1);
servo2.write(angle2);
// Debug
Serial.print("ADC=");
Serial.print(anavalue);
Serial.print(" angle1=");
Serial.print(angle1);
Serial.print(" angle2=");
Serial.println(angle2);
delay(20); // ~50Hz update
}
Two servo motors worked successfully in opposite phase with one potentiometer input.
Files¶
One Potentiometer -> One Servo Motor(SG90) Output Arduino Program
One Potentiometer -> Two Servo Motor(SG90) Anti-Phase Output Arduino Program
Useful information I got from Asian Session on March 31st day time¶
-
I need to study Mishael Sharaf in Kochi’s Output week study regarding the PWM.
-
Inforamtion for Saheen; DOIT ESP32 DevKit V1 Wi-Fi Development Board – Pinout Diagram & Arduino Reference
-
Inforamtion from Rico; Like Sevo Motor, Neo Pixel is currncy hngry device. Adafruit Neo Pixel consumption; Adafruit NeoPixel Überguide
-
Importing KiCAD line thickness from past project by Merin Cyriac
-
Servo Motor study by Ardradevi