Difference between revisions of "BoSL Board v0.3"

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==== BoSL BOARD V0.3 PIN LAYOUT ====
 
==== BoSL BOARD V0.3 PIN LAYOUT ====
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ATmega328P Pin Number Arduino IDE pin Internal Use Application Notes
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1 Reset RST Pull Low to reset Arduino
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2 D0 USB RX Free for use when no micro-USB connected
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! Header text !! Header text !! Header text !! Header text
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3 D1 USB TX Free for use when no micro-USB connected
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4 D2 SIM7000 RX Not Available for use
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| Example || Example || Example || Example
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5 D3 SIM7000 TX Not Available for use
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6 D4 SIM7000 On/Off Not Available for use
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| Example || Example || Example || Example
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7 VCC VCC N/A
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|-
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8 GND GND N/A
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| Example || Example || Example || Example
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9 Crystal XTAL Not Available for use
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|-
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10 Crystal XTAL Not Available for use
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| Example || Example || Example || Example
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11 D5 SIM7000 DTR Not Available for use
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12 D6 None Free for use
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| Example || Example || Example || Example
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13 D7 None Free for use
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14 D8 None Free for use
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| Example || Example || Example || Example
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15 D9 None Free for use
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|-
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16 D10 SD Chip Select Free for use with no SD card inserted
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| Example || Example || Example || Example
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17 D11 SD MOSI Free for use with no SD card inserted
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18 D12 SD MISO Free for use with no SD card inserted
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| Example || Example || Example || Example
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19 D13 SD Serial Clock Free for use with no SD card inserted
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20 VCC VCC N/A
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| Example || Example || Example || Example
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21 Aref None Free for use
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22 GND GND N/A
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| Example || Example || Example || Example
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23 A0 None Free for use
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24 A1 None Free for use
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| Example || Example || Example || Example
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25 A2 None Free for use
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26 A3 None Free for use
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| Example || Example || Example || Example
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27 A4 SDA Free for use when not operating I2C bus
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28 A5 SCL Free for use when not operating I2C bus
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| Example || Example || Example || Example
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==== SIM7000 SIM CARD COMMUNITCATION ISSUE ====
 
==== SIM7000 SIM CARD COMMUNITCATION ISSUE ====

Revision as of 16:31, 25 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!

BoSL BOARD V0.3 PIN LAYOUT

Header text Header text Header text Header text
Example Example Example Example
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Example Example Example Example
Example Example Example Example
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Example Example Example Example
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Example Example Example Example
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Example Example Example Example
Example Example Example Example
Example Example Example Example
Example Example Example Example
Example Example Example Example
Example Example Example Example
Example Example Example Example
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Example Example Example Example
Example Example Example Example
Example Example Example Example
Example Example Example Example
Example Example Example Example
Example Example Example Example
Example Example Example Example

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. They are quite different. Notably the bad boards only power the SIM VDD line for 3 pulses of 24 ms long whereas the working boards good boards keep this line high. The measurements are taken after the AT+CFUN=1 command is issued in the above test sequence.

In doing some reading on the issue it seems to have been encountered before, with the conclusion that it likely a soldering issue, possible inside the SIM7000 modual, thus leaving little course for it to be able to repaired.

for boards with a SIM inserted
PIN Good Board Bad Board
SIM_VDD
GOOD VDD SIM
BAD VDD SIM
SIM_RST
GOOD RST SIM
BAD RST SIM
SIM_CLK
GOOD CLK SIM
BAD CLK SIM
SIM_DATA
GOOD DATA SIM
 No Reading
for boards without a SIM inserted
PIN Good Board Bad Board
SIM_VDD
GOOD VDD NSIM
BAD VDD NSIM
SIM_RST
GOOD RST NSIM
BAD RST NSIM
SIM_CLK
GOOD CLK NSIM
BAD CLK NSIM
SIM_DATA
GOOD DATA NSIM
 No Reading
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