Most recent activity
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For some reason I'm not able to embed images or attach them. Here are the links to the images in case anyone would like to see what I came up with:
https://github.com/wminarik/images/blob/master/1206Resistor_LED.JPG
https://github.com/wminarik/images/blob/master/HM18_LED.JPG
https://github.com/wminarik/images/blob/master/LED_BLE_Connect.JPG -
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() { USB.setConsole(); } 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!
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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. -
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:
$GNGSA,A,3,01,07,08,17,21,30,,,,,,,3.4,1.7,2.9,1*33
$GNGSA,A,3,,,,,,,,,,,,,3.4,1.7,2.9,4*3E
$GPGSV,3,1,10,01,49,149,28,07,52,194,20,08,39,058,14,10,05,035,,0*6A
$GPGSV,3,2,10,13,17,304,,14,43,298,25,17,26,242,36,21,57,097,29,0*67
$GPGSV,3,3,10,27,08,060,,30,61,255,27,0*6C
$BDGSV,1,1,00,0*74
$GPTXT,01,01,01,ANTENNA OPEN*25It's found 10 GPS satellites ($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*25From the datasheet Gordon linked in, the choices are:
示例 $GPTXT,01,01,01,ANTENNA OPEN*25
表示天线状态（开路）
$GPTXT,01,01,01,ANTENNA OK*35
表示天线状态（良好）
$GPTXT,01,01,01,ANTENNA SHORT*63
表示天线状态（短路）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.
Montreal, Canada