Notes about Modems

Summary of Classes to use for Various Manufactured Modules

¹ The Quenctel BC95G based variant is not supported.

² The NB IOT UBee based on the SARA N211 is not supported.

Default baud rates of supported modules

Power Requirements of Supported Modems

¹ This is a firm minimum; the SIM7000 will not connect to the internet if only powered at 500mA.

Sleep and Reset Pin Labels

Pin Numbers to Use when Connecting to a Mayfly 0.x

Here are the pin numbers to use for modules that can be attached directly to an EnviroDIY Mayfly v0.3, 0.4, 0.5, 0.5b, or 0.5c using its Bee socket.

¹ To use the cellular Digi XBee's without the LTE adapter, your Mayfly must be at least v0.5b, you must use SJ13 to connect the Bee directly to the LiPo, and you must always have a battery connected to provide enough power for the XBee to make a cellular connection. If you turn off the Mayfly via its switch but leave the XBee connected as above, it will drain your battery very quickly. Disconnect the battery if you turn off the Mayfly.

² The Digi XBee reports ON/SLEEP_N on pin 13, but this is not connected to a Mayfly pin. Instead, you must use the XBee's CTS pin (pin 12) which is connected to Mayfly pin 19 and set the argument useCTSforStatus to true in the bee constructor.

³ If you close solder jumper 1 (SJ1) on the LTE adapter and use connect solder jumper 7 (SJ7) on the Mayfly to connect A5 to ASSOC, you can use A5 as the power pin for the XBee.

⁴ The LTE adapter switches pins 12 and 13 so that the true STATUS pin of the XBee is connected to Mayfly pin 19. You should set the argument useCTSforStatus to false in the bee constructor

⁵ I strongly recommend running a new wire along the back of the Mayfly to connect pin 5 of the XBee socket to pin A4. This will enable you to use A4 as the reset pin which allows you to use deep sleep.

⁷ I strongly recommend running two new wires along the back of the Mayfly to connect pin 5 of the XBee socket to pin A4 and pin 18 of the XBee socket to A3. This will enable you to use A4 as the reset pin and A3 as the sleep request pin. With those connections made, the Dragino BG96 becomes the only LTE module that can be run using only the 500mA regulator on the Mayfly (ie, without a separate battery connection for the modem).

⁸ This module is no longer produced or sold.

⁹ The EnviroDIY LTE Bee inverts the signal to the sleep request pin (PWRKEY) - which is also used for reset. To use it, you must add these commands to your setup:

modem.setModemWakeLevel(HIGH);
modem.setModemResetLevel(HIGH);

Pin Numbers to Use when Connecting to a Mayfly 1.x

Here are the pin numbers to use for modules that can be attached directly to an EnviroDIY Mayfly v1.0 or 1.1 using its Bee socket.

¹ This assumes you have not changed solder jumper 18. If you have switched SJ18 to connect bee pin one directly to 3.3V, use -1.

² The Digi XBee reports ON/SLEEP_N on pin 13, but this is not connected to a Mayfly pin by default. You can use the XBee's CTS pin (pin 12) which is connected to Mayfly pin 19 by default and set the argument useCTSforStatus to true in the bee constructor. Alternately (and preferably) you can change solder jumper 19 (SJ19) to connect bee pin 13 to D19 and set the argument useCTSforStatus to false.

³ Solder jumper 20 should be left in the default position, connecting pin A5 to bee pin 5.

⁴ The EnviroDIY LTE Bee inverts the signal to the sleep request pin (PWRKEY) - which is also used for reset. To use it, you must add these commands to your setup:

modem.setModemWakeLevel(HIGH);
modem.setModemResetLevel(HIGH);