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Add Battery_Readings

jlpoole 2026-02-20 14:59:49 -08:00
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# Trial of Exercise 12 (fw_build=20260220_022218_z) on February 19, 2026
### Power usages:
Each unit sends Lora message every 10 seconds and receives other 3 three units messages. Send and Receives are logged on the SD card. GPS is taken (I think) before each transmission. OLED displays incoming messages from other units.
Readings taken at 2:35 PM after I turned off units at 11:02 AM
From Log
Start End Fluke Measured 3 hrs later
Ed 4.172 3.708 3.763
Dan 4.158 3.738 3.752
Cy 4.145 3.665 3.665
Bob 4.172 3.708 3.716
Amy - not used
**Start** and **End** times are from logs reading values from the T-Beams's AXP2101 power-management IC (PMU). Fluke 87 V readings are from in-place battery ends with units powered down and not connected to USB taken at 2:35 PM after I powered down the units at 11:02 AM.
| Unit | Start | End | Fluke|
| -------- | -------- | -------- | -----|
| Ed | 4.172 | 3.708 |3.763|
|Dan |4.158 |3.738 |3.752|
|Cy |4.145 |3.665 |3.665|
|Bob |4.172 |3.708 |3.716|
|Amy - not used||||
Samples from logs:
```
jlpoole@jp ~/work/tbeam/logs/bob/202603301907/0773-52A8 $ ls -vr1la
total 5464
drwxr-xr-x 2 jlpoole jlpoole 32 Feb 20 11:08 gps
-rw-r--r-- 1 jlpoole jlpoole 400825 Feb 20 11:08 B_sent_20260220_111222.log
-rw-r--r-- 1 jlpoole jlpoole 447902 Feb 20 11:08 B_sent_20260220_022415.log
[redacted]
jlpoole@jp ~/work/tbeam/logs/bob/202603301907/0773-52A8 $ head -n 2 B_sent_20260220_022415.log
# session_start_epoch=1771554255 utc=2026-02-20 02:24:15 UTC node=B (Bob) fw_build=20260220_022218_z
epoch=1771554262 utc=2026-02-20 02:24:22 UTC unit=B msg=B lat= lon= alt_m= tx_count=1 batt_present=1 batt_v=4.172
jlpoole@jp ~/work/tbeam/logs/bob/202603301907/0773-52A8 $ tail -n 1 B_sent_20260220_111222.log
epoch=1771614162 utc=2026-02-20 19:02:42 UTC unit=B msg=B lat=44.936445 lon=-123.021873 alt_m=64.60 tx_count=5990 batt_present=1 batt_v=3.708
jlpoole@jp ~/work/tbeam/logs/bob/202603301907/0773-52A8 $
```