ADC readings, current sensor issue

Navio / Edge Hardware
1

Hi

I would like to measure current consumption with power module. A3 value is 0 when total consumption on test is 480mA. I have even try ADC example on two Navio2 boards with same results. Does anyone know what could be wrong? Here is a log from ADC example…

A0: 5.1340V A1: 5.0460V A2: 1.4520V A3: 0.0000V A4: 0.0320V A5: 0.0340V
A0: 5.1300V A1: 5.0420V A2: 1.4540V A3: 0.0000V A4: 0.0100V A5: 0.0340V
A0: 5.1280V A1: 5.0420V A2: 1.4560V A3: 0.0000V A4: 0.0080V A5: 0.0340V
A0: 5.1240V A1: 5.0400V A2: 1.4540V A3: 0.0000V A4: 0.0340V A5: 0.0160V
A0: 5.1280V A1: 5.0420V A2: 1.4540V A3: 0.0000V A4: 0.0080V A5: 0.0340V
A0: 5.1280V A1: 5.0460V A2: 1.4540V A3: 0.0000V A4: 0.0080V A5: 0.0320V
A0: 5.1280V A1: 5.0460V A2: 1.4540V A3: 0.0000V A4: 0.0080V A5: 0.0320V
A0: 5.1260V A1: 5.0420V A2: 1.4560V A3: 0.0000V A4: 0.0320V A5: 0.0160V
A0: 5.1300V A1: 5.0420V A2: 1.4580V A3: 0.0000V A4: 0.0320V A5: 0.0160V
A0: 5.1280V A1: 5.0420V A2: 1.4540V A3: 0.0000V A4: 0.0320V A5: 0.0340V
A0: 5.1280V A1: 5.0460V A2: 1.4520V A3: 0.0000V A4: 0.0080V A5: 0.0160V
A0: 5.1300V A1: 5.0420V A2: 1.4540V A3: 0.0000V A4: 0.0080V A5: 0.0320V
A0: 5.1300V A1: 5.0460V A2: 1.4540V A3: 0.0000V A4: 0.0080V A5: 0.0340V
A0: 5.1260V A1: 5.0480V A2: 1.4540V A3: 0.0000V A4: 0.0320V A5: 0.0160V
A0: 5.1260V A1: 5.0400V A2: 1.4540V A3: 0.0000V A4: 0.0080V A5: 0.0340V
A0: 5.1240V A1: 5.0460V A2: 1.4540V A3: 0.0000V A4: 0.0080V A5: 0.0360V
A0: 5.1280V A1: 5.0480V A2: 1.4540V A3: 0.0000V A4: 0.0080V A5: 0.0340V
A0: 5.1260V A1: 5.0480V A2: 1.4540V A3: 0.0000V A4: 0.0080V A5: 0.0340V
A0: 5.1300V A1: 5.0420V A2: 1.4540V A3: 0.0000V A4: 0.0100V A5: 0.0360V
A0: 5.1260V A1: 5.0480V A2: 1.4540V A3: 0.0000V A4: 0.0340V A5: 0.0340V
A0: 5.1300V A1: 5.0460V A2: 1.4520V A3: 0.0000V A4: 0.0320V A5: 0.0160V
A0: 5.1260V A1: 5.0460V A2: 1.4540V A3: 0.0000V A4: 0.0320V A5: 0.0160V
A0: 5.1300V A1: 5.0400V A2: 1.4540V A3: 0.0000V A4: 0.0320V A5: 0.0140V
A0: 5.1280V A1: 5.0420V A2: 1.4560V A3: 0.0000V A4: 0.0340V A5: 0.0160V
A0: 5.1280V A1: 5.0460V A2: 1.4520V A3: 0.0000V A4: 0.0080V A5: 0.0340V
A0: 5.1260V A1: 5.0460V A2: 1.4520V A3: 0.0000V A4: 0.0320V A5: 0.0160V
A0: 5.1280V A1: 5.0460V A2: 1.4560V A3: 0.0000V A4: 0.0320V A5: 0.0340V
A0: 5.1280V A1: 5.0420V A2: 1.4580V A3: 0.0000V A4: 0.0340V A5: 0.0160V
A0: 5.1260V A1: 5.0480V A2: 1.4540V A3: 0.0000V A4: 0.0080V A5: 0.0320V
A0: 5.1280V A1: 5.0420V A2: 1.4540V A3: 0.0000V A4: 0.0320V A5: 0.0140V
A0: 5.1260V A1: 5.0420V A2: 1.4540V A3: 0.0000V A4: 0.0080V A5: 0.0360V
A0: 5.1280V A1: 5.0460V A2: 1.4540V A3: 0.0000V A4: 0.0340V A5: 0.0160V
A0: 5.1280V A1: 5.0460V A2: 1.4560V A3: 0.0000V A4: 0.0080V A5: 0.0340V
A0: 5.1260V A1: 5.0420V A2: 1.4560V A3: 0.0000V A4: 0.0340V A5: 0.0160V
A0: 5.1300V A1: 5.0460V A2: 1.4540V A3: 0.0000V A4: 0.0080V A5: 0.0320V
A0: 5.1280V A1: 5.0420V A2: 1.4540V A3: 0.0000V A4: 0.0320V A5: 0.0160V
A0: 5.1300V A1: 5.0460V A2: 1.4560V A3: 0.0000V A4: 0.0080V A5: 0.0320V
A0: 5.1300V A1: 5.0420V A2: 1.4520V A3: 0.0000V A4: 0.0080V A5: 0.0360V
A0: 5.1300V A1: 5.0460V A2: 1.4520V A3: 0.0000V A4: 0.0320V A5: 0.0160V
A0: 5.1280V A1: 5.0460V A2: 1.4540V A3: 0.0000V A4: 0.0320V A5: 0.0140V
A0: 5.1260V A1: 5.0420V A2: 1.4540V A3: 0.0000V A4: 0.0080V A5: 0.0360V

  • Grega
2

Do you have a load connected to the XT60 output of the power module?

3

yes I have… today I have tried with another power module and now it show values, but are really small. I guess the A3 value should be multiplied by 60.000 to get amp readings. something must failed on my power module.

4

Maybe the load is too small? In what conditions do you test it? Do you have motors spinning?

5

I have tested with 600mA, 1900mA and 2500mA. I have volt amp meter connected on battery for reference.

6

These are quite small values and power module has low precision in this range. It should show 3.3V on 60A, so on 600mA it would show only 0.033V.

7

2 posts were split to a new topic: ADC readings problem