MoJo I2C Error Reading

Hardware
1

I just received my MoJo module to work on low power testing but I am getting a “mojo: I2C” error when sending a card.power request through the simulator. I currently have the high pulse Tadiran battery sold Blues connected to the MoJo’s Battery side then the load pinout going to the V+ JST terminal. I have the QWIC connector connected to the innermost port on my Notecarrier F V1.3 with the Swan attached. There is an external 3 wire sensor connected to the Notecarrier’s pinout (3.3v, A1, GND). The board is set to N_ATTN through the dip switch and I am connected to the Blues terminal through the microusb port on the notecarrier. I have also tried to setup an environment variable but there are no readings here either.

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How can I get this working?

2

Hi @jcorcoran,

Can you please try stripping away all other peripherals (e.g. that 3 wire sensor) and make sure you’re following the setup instructions provided in the Mojo Quickstart? Also, make sure you are connecting the Mojo before you provide power to your Notecarrier.

I’d just like to make sure there are minimal variables involved as we look into this!

Thanks,
Rob

3

I have taken off all peripherals (the swan and 3 wire sensor) and have followed the setup instructions in the quickstart tutorial. Here are the steps I took:

1: Connect QWIC Connector to MoJo and innermost port of notecarrier F
2: Connect High Pulse Tadiran to MoJo
3: Connect MoJo VOUT to V+ terminal of Notecarrier F
4: Connect laptop USB cable to Notecarrier F for simulator
5: Send power request to Notecarrier from terminal

Output of request:

> {"req":"card.power"}
{
 "err": "you have no mojo {no-mojo}",
 "milliamp_hours": 9.156833399999998
}

I have moved back Feather_EN to the on position during testing