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4

Ok I finally could get the sleeping current advertised on the datasheet. First, I removed the buck converter and supplied 4V directly to the module so I get better efficiency and removed the supply current needed for the buck converter. That allowed me to strip down a few milliamps, but the true cut down in power consumption was upgrading the module ...


4

Your antenna supplier is probably also an U-blox reseller ;) Seriously - pretty much all cellular modules: Telit, U-blox, Gemalto [former Cinterion], Simcom, Quectel are basically the same (I've tried Telit, U-blox, Simcom and Quectel myself). The basic AT commands (like dial, send SMS etc.) are standarized by 3GPP, and are the same across all modules. ...


2

I got some help from an Aeris engineer with this one. It turns out that when a SIM first registers with the network, it requires better signal quality than subsequent registrations. When the SIM has successfully registered with the network the first time, some information is stored on the SIM that allows it to register easier the next time. Mobile phones ...


2

Simcom has discontinued the Temperature readout for cost down reasons. The diodes in the module which are required for temperature readout are no longer assembled. The feature was not useful anyway, as the module heats up especially when charging the battery, so the readout way alway way above the ambient temperature.


1

So after watching my terminal for hours I realized something interesting!sometimes When ping request is sent to gsm module without any delay I get frame error and noise error. In reference manual I understood that frame error occurs when mcu couldn't find stop bit and noise error occurs when sampling bits don't strongly prove 1 or zero (maybe I'm not ...


1

The output capacitance of the AMS1117 is too less, causing the 3V3 to be unstable. The datasheet recommends 22μF: The circuit design used in the AMS1117 series requires the use of an output capacitor as part of the device frequency compensation. The addition of 22μF solid tantalum on the output will ensure stability for all operating conditions. When ...


1

It seems the version of the SIM800 Series User Manual that I posted above from Adafruit (v1.09) is out of date. The newer version v1.10 from simcomm2m.com mysteriously has the AT+CMTE? command removed. I guess that is SIMCom's subtle way of saying this command doesn't work.


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