How can I use my MMA7455 accelerometer

[steijehillewaert]

Hi

I just bought an accelerometer: MMA7455
I can't get it to work with Johnny-five.

Anyone have a solution?

Thanks

[dtex]

This device uses i2c for communication, so it will likely be similar to MPU6050 or one of the other i2c IMU's, someone just needs to add the new device. I've added your request for this to the list of requested features.

Here is the technical documentation for anyone who is interested in taking this on.

https://www.nxp.com/docs/en/data-sheet/MMA7455L.pdf

[steijehillewaert]

Is there any guide for supporting new devices? I would be down to write supporting code for this device myself?

[dtex]

@steijehillewaert That'd be great! We have the contributing.md document, but that doesn't have the detail you are looking for.

The code itself is pretty digestible. If you look in /lib/imu.js at Drivers.SHT31D, you can see an example implementation of an i2c IMU. I would look at the documentation for the MMA7455 and then each member of the Drivers object to find the closest fit. It is even conceivable that the MMA7455 will be the exact same as an existing driver and all you need is an alias (but life is rarely that easy).