johnheenan

Releases from poweropts branch on https://github.com/johnheenan/TTGO-T-Wristband are being updated so If interested please use latest release from https://github.com/johnheenan/TTGO-T-Wristband/releases on which there is a firmware.bin attached (some are a software only...

If someone could provide code to put the MPU9250 accelerometer in its lowest power state I will give it a try. Using the current mpuSleep() code is not ideal to...

Thanks for your response. There is a comparison links between MPU9250 and LSM9DS1 at https://github.com/kriswiner/MPU6050/issues/6 but there is no clear cut 'winner'. However I guess the LSM9DS1, being an ST...

Here are some measurements. As a result of these measurements I agree with the above. In a sleep state with IMU_SKIP (as per above ) turned on constant 609uA at...

I have just checked the dastasheet for the MPU9250. The idle mode current is 8uA. There is an low power accelerometer mode with DMP, gyrometer and magnetometer disabled of 19.8uA...

I am getting far better results with another T-Wristband using SKIP_IMU above. My guess is that it is currently drawing power at 10uA or under. I am reluctant to open...

Progress report after nearly four days with MPU9250 accelerometer permanently powered down with IMU_SKIP (as per above) and checking time several times each day: battery voltage at 3.68V (53%). It...

Unlike the first few days, at day 6 there has been a rapid decline in voltage during the day from around 20%? (unrecorded voltage) to 0% (3.09V down to 2.86V...

I have put up a PR but I am going to withdraw it and resubmit it with the following changes with regard to time zones. * Although the code works,...

Removed a line from the current PR and timezones branch preventing the IMU from remaining in deep sleep.