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.

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 $