@gerritv
I am using v1.3.0 of the BH1750 library which I think is the most recent version on github (updated Jan 22).
I had the same issue when using ONE_TIME_HIGH_RES_MODE in that the sensor would return an accurate light level on first power up but then each subsequent read would return the same value regardless of the light level.
Reading through the source code (I think) the measureReady statement is still missing a configure statement to re-power up the module.
So I put a configure statement in the main loop of the sketch which (I think) powers up the module and then a wait for 200ms to allow enough time before reading.
void loop(){
if (!lightSensor.configure(BH1750::ONE_TIME_HIGH_RES_MODE)){
Serial.println("Could not power up light sensor");
}
wait (200);
if (lightSensor.measurementReady()) {
uint16_t lux = lightSensor.readLightLevel();// Get Lux value
#ifdef MY_DEBUG
Serial.println(lux);
#endif
send(msgLight.set(lux, 1));
}
etc...
My device is a combination temp/hum sensor using a HTU21 and light sensor using BH1750.
I now get accurate light levels each read cycle.
In BH1750 continuous mode the current draw was about 0.15mA between reads. In one time mode it is now reading 0.01mA on my ammeter, i.e. almost too small to read.
At "https://www.mysensors.org/download/contributing#coding-guidelines-core-library", under "Signing CLA", the link to clahub.com is since long dead.
Maybe you can follow this example: https://github.com/chocolatey/choco/issues/2036
and replace with https://cla-assistant.io/ ?
JurjenBiewenga created this issue in chocolatey/choco
closed
CLAHub is down
#2036
@Trand Well, sorry, but nothing else comes to mind. If you have a scope or logic analyzer then you need to watch the actual signals on the wires and see what is happening.
If you don't, then you should pick up a cheap logic analyzer. You can get one for $10 and it's invaluable for tracking down things like this. I don't know where you are based, but I see them on Aliexpress all the time.
Reporting back: Yeah, I just now contacted them. The price they're quoting now is $3.89 per module and they want $35 shipping. They said "Mass production is about 2.5-2.2 USD", which is higher than what their Alibaba listing says for quantity 3 sample pricing, which they now say is 2 years out date and should be ignored. Checking, I see that the quoted pricing is actually slightly worse than the $3.82/unit in their Aliexpress store. What a joke. I mean, given that this is allegedly the manufacturer talking, who can't be bothered to keep their own Alibaba listing updated even though it's allegedly two years out of date.... I guess the pricing indicated on Alibaba means nothing, which certainly explains a lot.
Water Meter Pulse Sensor
