From af6d4fbc97aded65036771398e5557a8918eedf8 Mon Sep 17 00:00:00 2001 From: jlpoole Date: Fri, 20 Feb 2026 14:59:49 -0800 Subject: [PATCH] Add Battery_Readings --- Battery_Readings.md | 43 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) create mode 100644 Battery_Readings.md diff --git a/Battery_Readings.md b/Battery_Readings.md new file mode 100644 index 0000000..3b9e8c7 --- /dev/null +++ b/Battery_Readings.md @@ -0,0 +1,43 @@ +# 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 $ + + +``` \ No newline at end of file