Difference between revisions of "BoSL Board v0.3"
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|| Example | || Example | ||
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| − | | SIM_CLK || | + | | SIM_CLK || |
| + | [[File:GOOD CLK SIM.jpg|thumb|GOOD CLK SIM]] | ||
| + | || Example | ||
|- | |- | ||
| − | | SIM_DATA|| | + | | SIM_DATA|| |
| + | [[File:GOOD DATA SIM.jpg|thumb|GOOD DATA SIM]] | ||
| + | || Example | ||
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Revision as of 22:58, 20 November 2019
BOSL BOARD - THE ULTRA LOW POWERED IOT LOGGING DEVICE
This little beauty costs less than an Arduino and Sim5320a put together, yet it comes already assembled, runs on 4v, is ultra low power consuming (we removed all the overheads of the off the shelf arduinos) and can send data via the CAT-M1 or NB-IoT networks! We estimate that these things can log each minute for over 12months!
Contents
SIM7000 SIM CARD COMMUNITCATION ISSUE
2019/11/21:
There has been an issue where some of our boards aren't recognising the SIM cards, and so can't upload any data. To detect is if the issue is present the following AT command sequence can be sent.
GOOD RESPONSE
| Command | Response |
|---|---|
| AT+CFUN=0 | |
| +CPIN: NOT READY | |
| OK | |
| AT+CFUN=1 | |
| OK | |
| +CPIN = READY | |
| SIM READY |
BAD RESPONSE
| Command | Response |
|---|---|
| AT+CFUN=0 | |
| +CPIN: NOT READY | |
| OK | |
| AT+CFUN=1 | |
| OK | |
| +CPIN: NOT INSERTED |
We did some probing around with an oscilloscope to see if there were any electrical differences between the good and bad boards. Both had identical measured crystal frequencies of 7.9 - 8.1 MHz and SIM7000 - ATmega382p baud rates of about 9540.
The one difference which was found was in the signals issued from the SIM 7000 to the SIM card on pins SIM_VDD, SIM_RST, SIM_CLK, and SIM_DATA.
for boards with a SIM inserted
| PIN | Good Board | Bad Board |
|---|---|---|
| SIM_VDD | Example | |
| SIM_RST | Example | |
| SIM_CLK | Example | |
| SIM_DATA | Example |
