The Arduino version works in nearly the same way as the CircuitPython version. First, set up the Arduino IDE for use with Feather RP2040 as shown in this guide.
Then, copy the code below and paste it into a new Arduino document. Save it in your Arduino project folder, and then upload it to the Feather, using the settings shown in the guide linked above.
// SPDX-FileCopyrightText: 2022 John Park for Adafruit Industries
// SPDX-License-Identifier: MIT
// Motorized fader demo
// capsense implementation by @todbot / Tod Kurt
#include <Bounce2.h>
const int pwmA = 12; // motor pins
const int pwmB = 11;
const int fader = A0; // fader pin
int fader_pos = 0;
float filter_amt = 0.75;
float speed = 1.0;
int saved_positions[] = { 230, 180, 120, 60 } ;
int current_saved_position = 1 ;
const int num_buttons = 4;
const int button_pins[num_buttons] = {10, 9, 8, 7}; // feather silk != arduino pin number. 10, 9, 6, 5 on board
Bounce buttons[num_buttons];
bool motor_release_state = false; // to handle motor release
class FakeyTouch
{
public:
FakeyTouch( int apin, int athreshold = 300 ) { // tune the threshold value to your hardware
pin = apin;
thold = athreshold;
}
void begin() {
baseline = readTouch();
}
int readTouch() {
pinMode(pin, OUTPUT);
digitalWrite(pin,HIGH);
pinMode(pin,INPUT);
int i = 0;
while( digitalRead(pin) ) { i++; }
return i;
}
bool isTouched() {
return (readTouch() > baseline + thold);
}
int baseline;
int thold;
int pin;
};
const int touchpin_F = A3;
FakeyTouch touchF = FakeyTouch( touchpin_F );
void setup() {
Serial.begin(9600);
delay(1000);
pinMode (pwmA, OUTPUT);
pinMode (pwmB, OUTPUT);
analogWriteFreq(100);
analogWrite(pwmA, 0);
analogWrite(pwmB, 0);
for (uint8_t i=0; i< num_buttons; i++){
buttons[i].attach( button_pins[i], INPUT_PULLUP);
}
}
int last_fader_pos = fader_pos;
void loop() {
for (uint8_t i=0; i< num_buttons; i++){
buttons[i].update();
if( buttons[i].fell()) {
current_saved_position = i;
go_to_position(saved_positions[current_saved_position]);
}
}
if( touchF.isTouched()){
motor_release_state = true;
analogWrite(pwmA, 0);
analogWrite(pwmB, 0);
delay(60);
}
else{
motor_release_state = false;
go_to_position(saved_positions[current_saved_position]);
}
fader_pos = int( (filter_amt * last_fader_pos) + ( (1.0-filter_amt) * int(analogRead(fader) / 4 )) );
if (abs(fader_pos - last_fader_pos) > 1) {
Serial.println(fader_pos);
if (motor_release_state==false){
go_to_position(saved_positions[current_saved_position]);
}
last_fader_pos = fader_pos;
}
}
void go_to_position(int new_position) {
fader_pos = int(analogRead(fader) / 4);
while (abs(fader_pos - new_position) > 4) {
if (fader_pos > new_position) {
speed = 2.25 * abs(fader_pos - new_position) / 256 + 0.2;
speed = constrain(speed, -1.0, 1.0);
if (speed > 0.0) {
analogWrite(pwmA, 255);
analogWrite(pwmB, 0);
}
}
if (fader_pos < new_position) {
speed = 2.25 * abs(fader_pos - new_position) / 256 - 0.2;
speed = constrain(speed, -1.0, 1.0);
if (speed > 0.0) {
analogWrite(pwmA, 0);
analogWrite(pwmB, 255);
}
}
fader_pos = int(analogRead(fader) / 4);
}
analogWrite(pwmA, 0);
analogWrite(pwmB, 0);
}
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