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Member since Oct 2013 • Last active Jan 2022
  • 1 conversations

Montreal, Canada

Most recent activity

  • in Pico / Wifi / Original Espruino
    Avatar for wminarik

    HM-18 Module installs with the same pins as the HM-10 module. It’s advertised as BLE 5.0, and mine arrived with firmware v116, and there doesn’t seem to be an update for this module on the manufacturer’s website(http://jnhuamao.cn/download_rom_en.asp?i­d=1).
    Like the HM-10, it is configured using AT commands, and has only two modes; iBeacon and a proprietary UART service. The AT commands can configure the module for lower-power and sleep modes. Gordon has posted iBeacon JS code at: http://forum.espruino.com/conversations/­252971/

    I initially wired up a button and pull-up resistor to the System Key, pin 23. According to the data sheet, pulling to ground either disconnects a connected module or resets to a default configuration if already disconnected. Power cycling the module also disconnects, so I removed the button.

    I’ve configured a surface mount LE and 1206 resistor to shine through one of the board’s through-holes. Clear nail polish insulates the connections from the board, and the board still lays flat on a surface. The LED blinks when not connected, and stays on when connected.
    A simple script to control the on-board red LED can be controlled via the nRF Connect app to verify operation.

    function onInit() {
    Serial1.on('data', function(data) {
        if (data=="o") LED1.write(true); 
        if (data=="f") LED1.write(false); 

    Pretty nifty that a $5 add-on adds BLE communication to the versatile classic Espruino board!

  • in Pico / Wifi / Original Espruino
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    There are great instructions for adding a BLE 4.0 connection to an Espruino original board using the HM-10 module. Has anyone attempted to add a BLE 4.2/5.0 module such as the HM-18?
    It uses a CC2640 combatible chip.

  • in Bangle.js
    Avatar for wminarik

    The GNSS receiver on my Bangle.js 2 was able to get a fix fairly quickly. However it only finds 5-8 satellites at a time (I've occasionally had up to 10, briefly). Looking at the output NMEA sentences:
    $GPTXT,01,01,01,ANTENNA OPEN*25

    It's found 10 GPS satellites ($GPGSV) but only 6 are used for the fix ($GNGSA; sats 01,07,08,17,21,30). It doesn't look like it's even trying to find GLONASS satellites; there's a line for Beidou ($BDGSV) but no satellites are listed. Galileo satellites are also missing. uBlox receivers allow the choice of frequencies; the inexpensive ones allow the choice of two (e.g. GPS and GLONASS or GPS and Beidou). There must be a way to turn on at least the GLONASS frequency.

    The last line worries me a bit:
    $GPTXT,01,01,01,ANTENNA OPEN*25

    From the datasheet Gordon linked in, the choices are:
    示例 $GPTXT,01,01,01,ANTENNA OPEN*25
    $GPTXT,01,01,01,ANTENNA OK*35
    $GPTXT,01,01,01,ANTENNA SHORT*63

    This implies that part of our problem is that the antenna is not connected, or that there is no antenna (open circuit). If anyone has done a teardown of the production units, this could be verified.