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i'm hoping to get my first complete working version of a synthesizer using a few micro controllers, and a puck as a midi controller. it will use the light sensor as a theremin, and the button as a wobble controller. i also added a 20 watt per channel stereo amplifier shield, so it can fill a room with sound.

i'll add some details when back from my business trip this week.

i just tested my seeed grove moisture sensor with success, and a few notes:

1. need to convert from the sensor document values (0 - 950) to the espruino analogRead range (0-1)
   
2. different values depending on battery power vs usb. not sure how much the values will change over the life of the battery. sensor in water from the battery was .47, and from usb was .55
   
3. in order to use the sensor from the grove shield, i had to put a jumper from the 3.3v to 5v pins, as the shield uses the 5v pin for power. the sensor works with 3.3v - 5v range, so this was acceptable
   
   

when i replace my full code i'll post in another thread

i'm going to convert my shield arduino code to pixl anyway, just as an exercise. it was accurate on the arduino as a setup for my indoor plant starters, but it didn't have a sleep mode, and drained the batteries too quickly. i look forward to seeing how energy efficient the pixl can be with this setup.

the moisture sensor is only using 3 of the pins: vcc, gnd, sig. it's this one
http://wiki.seeedstudio.com/Grove-Moisture_Sensor/

here's the arduino code i'll try to convert to a pixl when i get home this weekend. it reads from a moisture sensor, and a temperature/humidity sensor, and displays the values to an rgb display. unfortunately i won't be able to change the display color based on the moisture level, but it will be a good test. in my case i'm using an arduino shield with a grove sensor kit, so it will be a good test on the pixl as a shield as well.

[#include](https://forum.espruino.com/search/?q=%23include) "Arduino.h"
[#include](https://forum.espruino.com/search/?q=%23include) "Wire.h" 
[#include](https://forum.espruino.com/search/?q=%23include) <rgb_lcd.h>
[#include](https://forum.espruino.com/search/?q=%23include) <TH02_dev.h>
[#include](https://forum.espruino.com/search/?q=%23include) <stdio.h>
[#include](https://forum.espruino.com/search/?q=%23include) <math.h>
[#include](https://forum.espruino.com/search/?q=%23include) <TimeLib.h>
[#include](https://forum.espruino.com/search/?q=%23include) <TimeAlarms.h>

rgb_lcd lcd;

const int button = 2;       // connect a button
const int buzzer = 3;       // connect a buzzer
// Test code for Grove - Moisture Sensor 
int sensorPin = A0; // select the input pin for the potentiometer
int moisture = -1; // variable to store the value coming from the sensor7
int prec = 0;
int buttonPress = 0;
int displayOn = 1;

void setup() {
    Serial.begin(9600);
    // declare the ledPin as an OUTPUT:
    pinMode(button, INPUT); //set button as an INPUT device
    pinMode(buzzer, OUTPUT);   //set LED as an OUTPUT device
    // set up the LCD's number of columns and rows:
    lcd.begin(16, 2);
    // Set the LCD background color
    setColor();
    Serial.println("****TH02_dev demo by seeed studio****\n");
    /* Power up,delay 150ms,until voltage is stable */
    delay(150);
    /* Reset HP20x_dev */
    TH02.begin();
    delay(100);
    
    /* Determine TH02_dev is available or not */
    Serial.println("TH02_dev is available.\n");   

    Alarm.timerRepeat(5, readSensors);
    Alarm.timerRepeat(60, displayOff);
}

void loop() {
    buttonPress = digitalRead(button); //read the status of the button
    if( buttonPress && !displayOn ) {
      lcd.display();
      displayOn = 1;
      setColor();
    }
    //digitalWrite(buzzer, btn);

    Alarm.delay(10);
}

void readSensors() {
  Serial.println("Reading sensors");
  // read the value from the sensor:
  moisture = analogRead(sensorPin);
  Serial.print("Moisture = " );
  Serial.println(moisture);
  float temper = TH02.ReadTemperature(); 
  Serial.println("Temperature: ");   
  Serial.print(temper);
  Serial.println("C\r\n");

  float humidity = TH02.ReadHumidity();
  Serial.println("Humidity: ");
  Serial.print(humidity);
  Serial.println("%\r\n");
  char message1[16];
  char message2[16];
  float ftemp = 1.8*temper + 32;
  long t = lround(ftemp);
  int tm = int((ftemp-floor(ftemp))*100)%100;
  long h = lround(humidity);
  int hm = int((humidity-floor(humidity))*100)%100;
  long m = moisture;
  sprintf(message1, "%ld.%dF, %ld.%dRH", t, tm, h, hm);
  Serial.println(int((temper-floor(temper))*100)%100);
  setColor();
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print(message1);
  lcd.setCursor(0,1);
  sprintf(message2, "Moisture: %3ld", m);
  lcd.print(message2);
}

void displayOff() {
  if( buttonPress ) {
    buttonPress = 0;
  }
  else {
    lcd.noDisplay();
    lcd.setColorAll();
    displayOn = 0;
  }
}

void setColor() {
  if( displayOn ) {
    if( moisture < 0 ) {
      lcd.setColorAll();
    }
    else if( moisture < 300 ) {
      lcd.setColor(RED);
    }
    else if( moisture < 650 ) {
      lcd.setColor(GREEN);
    }
    else {
      lcd.setColor(BLUE); 
    }
  }
}

i have something similar from a grooove sensor kit. i can try it this weekend, or at least give the arduino code. i know i just did an analog read off of a0. the values ranged from 0 - 800 or so. using it for plant soil moisture, i had values between 300 and 650 as acceptable moisture.

how hot does that get?

nice!

the two other categories i'd put high on my projects are shields for relays (to control high voltage) and audio/dac to add music to my projects.

this data logging shield would be very convenient: https://www.adafruit.com/product/1141

i installed polyfill, and it allows the example web bluetooth pages to work online and locally. when i try to use espruino.com/ide it finds the bluetooth devices but crashes the bluetooth adapter when connecting to a puck. it says it can't get the board configuration, but it connects with no prompt available. again i can send code to the puck, and it loads, but an error follows saying that it can't get a prompt, and it's trying to recover.

i haven't gotten to testing flow control yet, but since web bluetooth is working locally on windows with node express, then i'll use this opportunity to see what kind of dashboard i can get going. i'll continue more updates in a different thread.

at least now i can program my hacking board remotely, and not need to be connected to the internet. now i can hack from a park just as easily as a coffee shop :)

i like it :)

i have espruino.com/ide working on my rpi 3 b+ in chromium, but have not been able to get a local ide build working either.

this is where it gets interesting, and i really just started experimenting with what works. out of the box these work with the uart friend and the wifi paired:

1. Adafruit Bluefruit LE android app
   
2. This example http://www.espruino.com/Puck.js+Web+Bluetooth
   
3. The same example running locally on an rpi 3 b+ with express https
   
   

the web bluetooth ide sort of works from my rpi with this setup. it connects to the uart friend, but doesn't get a proper prompt setup. i can upload code from the right side, and use the repl, but it gives errors. interestingly, i can connect the web bluetooth ide to the uart, and the windows native ide directly to the wifi, and see console output on both sides :)

the windows native ide sees the uart friend but fails to connect. it does connect to my puck just fine.

the web bluetooth ide on windows behaves similarly to pucks and the uart friend, in that it will connect, but give no prompt. and then sometimes it just doesn't work at all on windows in chrome.

ultimately i'd like to have a local web bluetooth ide working. it looks doable on my rpi 3 b+. i haven't tried it yet on windows. the web bluetooth examples seem to have problems loading the bluetooth adapter in chrome on windows as well.

frustrating world for web bluetooth development at the moment.

i will say using web bluetooth is a very convenient way to communicate with the esp wifi via the uart friend. my hacking board is completely wireless, and i can program the esp wifi via bluetooth.

i don't think it would be hard to expand this to be a full IDE, though it's just my personal setup.

yes, that link was the impetus for wanting to use NRF on the esp wifi. there's always a chink in the armor. i look forward to the new board.

thx. will the new ble board be breadboard friendly? i currently have a large breadboard to hack around in coffee shops, with separate switchable power for the esp wifi and the le uart ble. i'm finding how unfriendly it is to secure ble devices, hence the switchable power for when not in use.

Is it possible to use the NRF module on an espruino wifi? I have an LE UART Friend https://www.adafruit.com/product/2479 and it is connected to my espruino on B5, B6, B7. Works great in UART and CMD mode, but it would be awesome to use the NRF module to interface with it. That module doesn't seem to be included with the wifi build.

all the good things :)

thanks for the updates.

interesting

glad we got this sorted out. now i can move on to programming ble on my pucks :)

ok, this is working now with espruino as the ws client, and ws server. getPage() is working as well.

i do have an additional question: when espruino is the ws client, and i send a message from the node.js server, it shows up as a rawData event as well as a message event. is this expected?

wsConnect()
=undefined
RAW: HTTP/1.1 101 Switching Protocols
Upgrade: websocket
Connection: Upgrade
Sec-WebSocket-Accept: NRGmTTLwn7B71D1ZNRdkobCXs/0=
Sec-WebSocket-Protocol: echo-protocol
Handshake Success
Connected to server
RAW:  something
MSG: something

which build are you looking at? the larger remaining problem is the espruino not working as a websocket server, as documented in the github issues https://github.com/espruino/Espruino/issues/1405.

i'll test again if you let me know which build to look at.

also with 1v97.62 i am not able to complete a websocket connection with espruino as the server and a webpage as the client. it stays in the connecting state. same code is working in 1v96

i tried 1v97.62 as well. this code does not return a page to the repl anymore

function getPage() {
  require("http").get("http://www.pur3.co.uk/hello.txt", function(res) {
    console.log("Response: ",res);
    res.on('data', function(d) {
      console.log("--->"+d);
    });
  });
}