Measure the power consumption of an output device.
Document your work on the group work page and reflect on your individual page what you learned
Individual assignment:
Add an output device to a microcontroller board you’ve designed and program it to do something.
From the things that our instructor said, here are some definitions and statements that i learned and you shoul know before starting this task.
We needed to understand how power worked, what we are measuring and the relation between this forces in electricityy first let's define the main variables in a circuit Current(I), Voltage(V), Resistance(R) and power(P).
Power The amount of energy used or transferred per unit of time. Think of it like the strength of an electrical flow - higher power means more energy being used or transferred.
Voltage Often likened to electrical pressure, voltage is the force that pushes electrical charges through a conductor (like a wire). Higher voltage means more force, like higher water pressure in a hose pushing water through.
Current This is the flow of electrical charge carriers, usually electrons, through a conductor. Imagine it as the rate of flow of electricity in a circuit - higher current means more electrons flowing per second.
Resistance Resistance opposes the flow of electrical current. It's like friction in a pipe that reduces the flow of water. Materials with high resistance require more voltage to produce the same current flow.
Ohm's Law Wheel Explanation
This image is called an Ohm’s Law Wheel, and it helps explain the relationships between power (P), voltage (V), current (I), and resistance (R) in electrical circuits. It’s divided into sections that provide formulas depending on which two of these four quantities you know and which one you want to calculate.
Key Terms:
Power (P): Measured in watts (W), it indicates how much energy is being used or transferred.
Voltage (V): Measured in volts (V), it's the electrical pressure or potential difference.
Current (I): Measured in amps (A), it’s the flow of electrical charge.
Resistance (R): Measured in ohms (Ω), it shows how much the material opposes the flow of current.
How to Use It:
Start by identifying what you know and what you need to find out. Each quadrant shows formulas related to specific parameters.
Examples:
If you know Voltage (V) and Resistance (R): Use I = V / R to find Current.
If you know Power (P) and Voltage (V): Use I = P / V to find Current.
Wheel Structure:
Top left (green section): Deals with Power. Examples: P = V × I or P = V² / R
Top right (pink section): Focuses on Voltage. Examples: V = I × R or V = √(P × R)
Bottom left (yellow section): Focuses on Current. Examples: I = P / V or I = √(P / R)
Bottom right (blue section): Focuses on Resistance. Examples: R = V / I or R = V² / P
Why It’s Useful:
This wheel simplifies calculations in electrical circuits by letting you choose the right formula based on what you know. It’s handy for students, engineers, or anyone working with electronics.
Steps to Connect an OLED Display to XIAO RP2040 (first board)
To do this assigment i used the board that i had used in the Inputs Task here you can take a view of it.
1. Identify the pins on the OLED display:
GND: Ground
VCC: Power supply voltage (3.3V or 5V)
SCL: Clock line (Serial Clock)
SDA: Data line (Serial Data)
2. Identify the pins on the XIAO RP2040 board:
GND: Ground
3V3 (or 5V): Power supply voltage
SCL: Pin labeled as SCL (default D4)
SDA: Pin labeled as SDA (default D5)
3. Connect the wires:
GND (display) to GND (XIAO RP2040)
VCC (display) to 3V3 (XIAO RP2040) or 5V
SCL (display) to SCL (XIAO RP2040) (D4)
SDA (display) to SDA (XIAO RP2040) (D5)
4. Configure the software:
Use a library like Adafruit_SSD1306 or U8g2 to manage the OLED display.
Make sure to configure the I2C address of the OLED correctly in the code (typically 0x3C).
Finally i make a code that counts 1 + 1 every one second and make a format to show by column, this format will help me in m final project where i will have differents measures of Absorbence.
#include
#include
#include
// Definición de ancho y alto de la pantalla
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET -1 // Reset pin # (or -1 if sharing Arduino reset pin)
#define SCREEN_ADDRESS 0x3C // Dirección I2C estándar para la pantalla OLED
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
// Valores iniciales de absorbancia
float absorbancia[] = {1, 2, 3, 4, 5, 6}; // Valores iniciales
void setup() {
display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS); // Inicializar la pantalla OLED
display.clearDisplay(); // Limpiar el buffer
display.display(); // Actualizar pantalla inicial
}
void loop() {
// Actualizar y mostrar los datos en la pantalla
mostrarAbsorbancia();
delay(1000); // Actualizar cada 2 segundos
}
// Función para mostrar los datos en la pantalla
void mostrarAbsorbancia() {
display.clearDisplay(); // Limpiar la pantalla
// Mostrar título y línea separadora
display.setTextSize(1);
display.setTextColor(SSD1306_WHITE);
display.setCursor(10, 0); // Posición para el título
display.println(F("Absorbancia (nm)"));
display.drawLine(0, 10, SCREEN_WIDTH, 10, SSD1306_WHITE); // Línea horizontal
// Mostrar cada valor con su columna
for (int i = 0; i < 6; i++) {
display.setCursor(0, 15 + (i * 10)); // Posición vertical ajustada para cada fila
display.print(F("- Columna "));
display.print(i + 1);
display.print(F(": "));
display.println(absorbancia[i], 4); // Mostrar valor con 4 decimales
}
display.display(); // Mostrar contenido actualizado en la pantalla
// Incrementar los valores secuenciales
actualizarAbsorbancia();
}
// Función para incrementar secuencialmente los valores de absorbancia
void actualizarAbsorbancia() {
for (int i = 0; i < 6; i++) {
absorbancia[i] += 1; // Incrementar cada valor en 1
}
}
Video
Here i have a video that could help you to understand more of how to programmed LCD SSD1306 on You Tube
Second board: Xiao RP2040 to control NEMA 17
I did a second task just to make a few trials of how to connect the microcontroller with a Nema 17 Motor DC, expecting to make a progress of how i will connect and control my CNC of my final project
For this assigment i used the board that i fabricated on my week of Electronics design take a look if you want to check the pcb or schematics
Steps to Connect NEMA 17 with A4988 Driver to XIAO RP2040
1. Identify the Pins on the A4988 Driver
VMOT: Motor power supply (8-35V)
GND: Ground for motor power
VDD: Logic power supply (3-5.5V)
STEP: Step signal (controls the motor's steps)
DIR: Direction signal (controls the rotation direction)
ENABLE: (optional) Enables or disables the driver
MS1, MS2, MS3: Set microstepping mode (optional)
2A, 2B, 1A, 1B: Connect to stepper motor coils
2. Identify the Pins on XIAO RP2040
Select any digital pins for STEP and DIR signals
Use the 3V3 pin for logic power
Use the GND pin for ground
3. Connect the Power Supply
Connect VMOT on the A4988 to the positive terminal of your motor power supply (8-35V)
Connect GND on the A4988 to the ground terminal of the motor power supply
Add a 100 µF capacitor between VMOT and GND (to prevent voltage spikes)
4. Connect Logic Power
Connect VDD on the A4988 to the 3V3 pin of the XIAO RP2040
Connect GND on the A4988 to the GND pin of the XIAO RP2040
5. Connect Control Signals
STEP pin (A4988) → Connect to any digital output pin on the XIAO (e.g., D2)
DIR pin (A4988) → Connect to another digital output pin on the XIAO (e.g., D3)
(Optional) ENABLE pin (A4988) → Connect to another digital pin or leave unconnected
6. Connect the Motor to A4988
1A and 1B → Connect to one coil of the NEMA 17
2A and 2B → Connect to the other coil of the NEMA 17
7. Optional: Microstepping Configuration
To use microstepping, connect MS1, MS2, and MS3 to logic HIGH or LOW:
