I want my SIM800 module (I interfaced it with Arduino Uno) to enter sleepmode-2 (I used AT+CSCLK=2 command). My question is, how do I wake it up from sleep? I tried giving various AT commands but I cannot see anything on the Arduino Terminal.
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\$\begingroup\$ elecrow.com/download/… Read the AT+CSCLK description. \$\endgroup\$– Bence KaulicsCommented Sep 13, 2017 at 17:33
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4 Answers
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Got it working with AT+CSCLK=2. Module wakes up with AT commands sent to the serial port of the module. No interaction with DTR pin except it needs to be high.
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According to this page, to wake it up, you need to send any AT command, which will be ignored by the module (so no response), followed (within 5 seconds) by
AT+CSCLK=0
It took me all of one minute to find that by Googling "SIM800 sleep wake".
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\$\begingroup\$ Yes, but it does not work, The module ignores both DTR and communication on serial line after entering sleep mode \$\endgroup\$– user167261Commented Oct 29, 2017 at 14:40
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Old thread but actual topic...Sleep mode 1 is made to enter and leave the sleep mode using the DTR pin. You can use it in this way:
- DTR is LOW
- PREPARE the module with +CSCLK=1 ("AT+CSCLK=1\r")
- DTR goes HIGH -> SLEEP
- DTR goes LOW -> WAKE UP
To save more power +CFUN=0 before SLEEP and +CFUN=1 after WAKE UP.
Greetz Putzlicht
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\$\begingroup\$ Adding an answer to an old question is frowned upon around here. It is a better practice to ask a new question with a link to the old question. \$\endgroup\$– Dan1138Commented May 19, 2020 at 17:36
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2\$\begingroup\$ I appreciate this answer. Don't listen to Dan! \$\endgroup\$ Commented Jun 20, 2020 at 3:46
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The second AT needs to follow the first within 50 ms. This could be AT+CSCLK=0 if you want the SIM800 to stay awake. You don't want it napping when you are waiting for it to confirm a connection. I think the DTR pin needs to be held high too and if you arrange that via a GPIO pin you can use AT+CSCLK=1.
