Arduino MKR NB1500: lukt niet om te verbinden.
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@Stefan-de-Lange
Yes, this is how it should work, and would save a lot of reconnection time, but so far I think >15mA is too much (reconnection time is about 20 s at around 60 mA on average). -
@Crowdsourcer If you see 15 mA it means there is a problem. I measured an average of 6.7 uA in PSM
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Some follow up since last year: My MKR NB1500’s are all running on LiPo’s and the SARA modem is not transmitting any more at voltages below 3.8V. I looked up the schematics of this board and it appears that there is a 3V8 powerline for the SARA modem. However it is not produced anywhere on the board? The SARA modem power requirements state “typical 3.8V” so it could be that my SARA’s are a batch that does not like voltages even slightly lower than 3.8V? Seems like a bad board design? Anyone experiencing the same problems?
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@Crowdsourcer That can be many things. Maybe the LiPo is bad, has too little charge or has too low capacity/current capability? I would suggest to test using a bench power supply and try to steadily lower the voltage. If that also doesn’t work then perhaps the module is faulty
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LiPo is fine (almost new 6000mAh)! I checked the schematics again and it appears that the 3.8V is produced from the LiPo by charge controller BQ24195. This 3.8V is then fed to the SARA modem and a LDO voltage regulator (AP2112) and converted to 3.3V. Seems that something is wrong with this converter, or its configuration?
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@Crowdsourcer I don’t know. BQ24195 is pretty solid. Probe it if you need to.