Back in November, 2021 I had quite a bit of help from the community while I was trying to get the Feather M0 from Adafruit to work with app inventor. Being a noobie with AI, I was out of sorts since I couldn’t get anything to work so that I could at least muddle through learning AI. I then gave up and bought a HC-05 for my Arduino and have since been very successful in creating an app using it and AI. I now feel the need to try and make the Feather work but I’m getting ready to hang it up again! Thought I’d try one more time here.
I have successfully used Gerrikoio’s example “ BLE GP-O Controller” to produce his app on my Feather, but I am still having trouble being able to pass data from the Feather to the app. I have removed a bunch of blocks from his app in order to make it easier to follow and added a few blocks that I thought should work. The following code still works to flash the LED on the board by pressing the “pin 6” button on the app. To simplify, I’m just trying to pass any data to the app and it should show in the “pin 1” slot, but it doesn’t. I know the Feather is different from others, but I’m hoping those differences are taken care of in Gerrikoio’s app, so I just added a few blocks for the data. I only added 2 lines (lines 14 & 15 from the bottom) to his Feather code in a place where it should pass the word “test” to the app when the “pin 6” button is pressed.
[code]
/*********************************************************************
This is an example for our nRF51822 based Bluefruit LE modules
Pick one up today in the adafruit shop!
Adafruit invests time and resources providing this open source code,
please support Adafruit and open-source hardware by purchasing
products from Adafruit!
MIT license, check LICENSE for more information
All text above, and the splash screen below must be included in
any redistribution
*********************************************************************/
/*********************************************************************
* This is modified program is linked to an MIT App Inventor App to control
* up to 6 GP-O's. This program only accepts data from teh App. It
* does not reply to the app in any way.
*
* App developed by Gerrikoio, using an example provided with the nRF51822
* library from Adafruit.
*
* MIT license applies.
*
*********************************************************************/
#include <Arduino.h>
#include <SPI.h>
#if not defined (_VARIANT_ARDUINO_DUE_X_) && not defined (_VARIANT_ARDUINO_ZERO_)
#include <SoftwareSerial.h>
#endif
#include "Adafruit_BLE.h"
#include "Adafruit_BluefruitLE_SPI.h"
#include "Adafruit_BluefruitLE_UART.h"
#include "BluefruitConfig.h"
/*=========================================================================
APPLICATION SETTINGS
FACTORYRESET_ENABLE Perform a factory reset when running this sketch
Enabling this will put your Bluefruit LE module
in a 'known good' state and clear any config
data set in previous sketches or projects, so
running this at least once is a good idea.
When deploying your project, however, you will
want to disable factory reset by setting this
value to 0. If you are making changes to your
Bluefruit LE device via AT commands, and those
changes aren't persisting across resets, this
is the reason why. Factory reset will erase
the non-volatile memory where config data is
stored, setting it back to factory default
values.
Some sketches that require you to bond to a
central device (HID mouse, keyboard, etc.)
won't work at all with this feature enabled
since the factory reset will clear all of the
bonding data stored on the chip, meaning the
central device won't be able to reconnect.
MINIMUM_FIRMWARE_VERSION Minimum firmware version to have some new features
MODE_LED_BEHAVIOUR LED activity, valid options are
"DISABLE" or "MODE" or "BLEUART" or
"HWUART" or "SPI" or "MANUAL"
-----------------------------------------------------------------------*/
#define FACTORYRESET_ENABLE 1
#define MINIMUM_FIRMWARE_VERSION "0.6.6"
#define MODE_LED_BEHAVIOUR "MODE"
/*=========================================================================*/
// Create the bluefruit object, either software serial...uncomment these lines
/*
SoftwareSerial bluefruitSS = SoftwareSerial(BLUEFRUIT_SWUART_TXD_PIN, BLUEFRUIT_SWUART_RXD_PIN);
Adafruit_BluefruitLE_UART ble(bluefruitSS, BLUEFRUIT_UART_MODE_PIN,
BLUEFRUIT_UART_CTS_PIN, BLUEFRUIT_UART_RTS_PIN);
*/
/* ...or hardware serial, which does not need the RTS/CTS pins. Uncomment this line */
// Adafruit_BluefruitLE_UART ble(BLUEFRUIT_HWSERIAL_NAME, BLUEFRUIT_UART_MODE_PIN);
/* ...hardware SPI, using SCK/MOSI/MISO hardware SPI pins and then user selected CS/IRQ/RST */
Adafruit_BluefruitLE_SPI ble(BLUEFRUIT_SPI_CS, BLUEFRUIT_SPI_IRQ, BLUEFRUIT_SPI_RST);
/* ...software SPI, using SCK/MOSI/MISO user-defined SPI pins and then user selected CS/IRQ/RST */
//Adafruit_BluefruitLE_SPI ble(BLUEFRUIT_SPI_SCK, BLUEFRUIT_SPI_MISO,
// BLUEFRUIT_SPI_MOSI, BLUEFRUIT_SPI_CS,
// BLUEFRUIT_SPI_IRQ, BLUEFRUIT_SPI_RST);
// -------------- DEMO APP GP-O PIN REFERENCE --------------------------------------------------
// These are the pin reference values (if you do not want a pin set then enter a 0 in the array)
// MIT App button "Pin1" is 1st item in the array (refers to Feather MO pin-5), button "Pin2" is the 2nd (refers to Feather MO pin-6) etc.
// ---------------------------------------------------------------------------------------------
const byte pinRef[6] = {5, 6, 9, 10, 11, 13};
bool cmdStr = false; // A flag to inform which GPIO pin selected
byte pinNo = 0;
// A small helper
void error(const __FlashStringHelper*err) {
Serial.println(err);
while (1);
}
/**************************************************************************/
/*!
@brief Sets up the HW an the BLE module (this function is called
automatically on startup)
*/
/**************************************************************************/
void setup(void)
{
delay(500);
// Configure the pin modes
for (byte i = 0; i < 6; i++) {
pinMode(pinRef[i], OUTPUT);
digitalWrite(pinRef[i], HIGH);
}
Serial.begin(115200);
Serial.println(F("MIT App Inventor GPIO Control Example"));
Serial.println(F("------------------------------------------------"));
if ( !ble.begin(VERBOSE_MODE) )
{
error(F("Couldn't find Bluefruit, make sure it's in CoMmanD mode & check wiring?"));
}
if ( FACTORYRESET_ENABLE )
{
/* Perform a factory reset to make sure everything is in a known state */
Serial.println(F("Performing a factory reset: "));
if ( ! ble.factoryReset() ){
error(F("Couldn't factory reset"));
}
}
/* Disable command echo from Bluefruit */
ble.echo(false);
/* Print Bluefruit information */
ble.info();
ble.verbose(false); // debug info is a little annoying after this point!
Serial.println(F("Waiting for connection"));
delay(500);
for (byte i = 0; i < 6; i++) {
digitalWrite(pinRef[i], LOW);
delay(500);
}
/* Wait for connection */
while (! ble.isConnected()) {
delay(500);
}
Serial.println(F("******************************"));
// LED Activity command is only supported from 0.6.6
if ( ble.isVersionAtLeast(MINIMUM_FIRMWARE_VERSION) )
{
ble.sendCommandCheckOK("AT+HWModeLED=" MODE_LED_BEHAVIOUR);
}
// Set module to DATA mode
Serial.println( F("Connected. Switching to Data mode!") );
ble.setMode(BLUEFRUIT_MODE_DATA);
Serial.println(F("******************************"));
}
/**************************************************************************/
/*!
@brief Constantly poll for new command or response data
*/
/**************************************************************************/
void loop(void)
{
if (ble.available()) {
byte c = ble.read();
if (!cmdStr) {
if (isAlpha((char)c)) {
switch ((char)c) {
case 'A': // pin 1
if (pinRef[0] != 0) {
pinNo = pinRef[0];
cmdStr = true;
}
break;
case 'B': // pin 2
if (pinRef[1] != 0) {
pinNo = pinRef[1];
cmdStr = true;
}
break;
case 'C': // pin 3
if (pinRef[2] != 0) {
pinNo = pinRef[2];
cmdStr = true;
}
break;
case 'D': // pin 4
if (pinRef[3] != 0) {
pinNo = pinRef[3];
cmdStr = true;
}
break;
case 'E': // pin 5
if (pinRef[4] != 0) {
pinNo = pinRef[4];
cmdStr = true;
}
break;
case 'F': // pin 6
if (pinRef[5] != 0) {
pinNo = pinRef[5];
cmdStr = true;
}
break;
default:
Serial.print((char)c);
Serial.println(F( " is not a valid GPIO pin reference"));
}
}
}
else {
if (isDigit((char)c)) {
if ((char)c == '0') {
if (pinNo) digitalWrite(pinNo, LOW);
ble.println("test");
Serial.println("test");
}
else if ((char)c == '1') {
if (pinNo) digitalWrite(pinNo, HIGH);
}
else {
Serial.print((char)c);
Serial.print(F( " is not valid for GPIO pin: "));
Serial.println(pinNo);
}
}
cmdStr = false;
}
}
}
[/code]
(upload://kxlg2Fc1q6koNA28qqVLJcAxXmS.png)
Sorry, that's hard to read. Hope this is better:
Thanks for any help.
Doug