Week10：Input devices

Previous week｜Assciment list｜Next week

Trying to measure the light.

• I found a light sensor module and prepare to modify the previous PCB board to get the 'AOUT' reading.

• modify the helloecho sch file.
• remove led and button.
• replace the chip from attiny44 to attiny45
• Connect the module: add JP2, connect pin 3 to attiny45s' pin 7.
• reroute the wire manually.

• use fabmodule.org to generate .rml file and send it to the SRM-20 CNC.

• Durning soldering, I found a pin header is not connect to any wire.

• In the first try, I fail.

  

Second try: redesign the PCB

• This time, I decide to wrote my own code to test this circuit.

  • I use Attiny45 pin5 and pin6 as RX / TX
  • I remove the cystal and trying to connect the PB3 pin to light sensor module AOUT.
  

Programing the board

• accroding to Attiny's pinout diagram, I am trying to write some simple code to monitor the light sensor data in console monitor.
• connect the hello light 2 board to the ftdi dongle.
• open arduino IDE, select the tool -> serial port -> usbserial devices
• use console monitor window to check the result.

The demo video, demo code and original eagel pcb design file

#include<SoftwareSerial.h>

SoftwareSerial mySerial(0, 1);  // RX pin5, TX pin6

void setup() // setup all pins as OUTPUTS to drive current for
{
    mySerial.begin(9600);
    pinMode(A1, INPUT);
}

void loop()
{
    int sensorVal = analogRead(A1);
    
    int scaledValue = map(sensorVal, 0, 1023, 0, 255);

    mySerial.println(sensorVal);
    
    delay(200);

}

• The layout file is here:
  .sch file
  .brd file

• What I learn:

  • define the RX/TX pins in the program sketch
  • Switch the serial port setting to monitor the different devices signal.
  • to speed up the PCB design process.

This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.