DVT Report — V2.0

Expected: All OK on each board; at least 4 boards must pass

Plan §SCR-01

Expected: 15–90 mA, limit not hit on each board; at least 4 boards must pass

Plan §SCR-02

Expected: 3.25–3.35 V on each board; at least 4 boards must pass

Measured: board 1: 3.29 V · board 2: 3.291 V

Plan §SCR-03 · boards 1 and 2

Expected: Programs and runs on each board; at least 4 boards must pass

Measured: board 1: pass · board 2: pass

Plan §SCR-04 · boards 1 and 2

Expected: 9/9 pairs pass on each board; at least 4 boards must pass

Plan §SCR-05

Expected: All pixels, border and crosshair correct; no missing rows/columns on each board; at least 4 boards must pass

Plan §SCR-06

Expected: Correct colours in the right order (SK6812-B) on each board; at least 4 boards must pass

Plan §SCR-07

Expected: Both work on each board; at least 4 boards must pass

Plan §SCR-08

Expected: Found at 0x44; plausible temperature and humidity on each board; at least 4 boards must pass

Plan §SCR-09

Expected: Sees the home AP; RSSI within 6 dB of the other boards (record) on each board; at least 4 boards must pass

Measured: board 1: -67 dBm · board 2: -68 dBm

Plan §SCR-10 · boards 1 and 2

Expected: ≈ 303 mA (R5 3.3 kΩ) on each board; at least 4 boards must pass

Measured: board 1: 302.8 mA · board 2: 302.5 mA

Plan §SCR-11 · boards 1 and 2

Expected: 0.03–0.11 V (V1.0 board 1: 0.071 V) on each board; at least 4 boards must pass

Measured: board 1: 0.065 V · board 2: 0.061 V

Plan §SCR-12 · boards 1 and 2

Expected: VUSB 4.75–5.25 V with USB; USB flag clears on battery on each board; at least 4 boards must pass

Measured: board 2: pass

Plan §SCR-13 · board 2

Expected: Portal → Wi‑Fi → time and weather → RGB colour → battery icon on each board; at least 4 boards must pass

Measured: board 2: pass

Plan §SCR-14 · board 2

Expected: + on pin 1

Result: Correct polarity. A cell plugged in backwards did not damage the board.

Plan §REV-01

Expected: Plug latches, J2 undisturbed; seats in a breadboard; labels correct

Result: The battery plug latches, the board seats in a standard breadboard, and all 24 header labels match the pinout.

Plan §REV-02

Expected: ≈ 303 mA

Measured: 302.8 mA

Result: 302.8 mA and 302.5 mA on two boards.

Plan §REV-03 · boards 1 and 2

Expected: 4.168–4.232 V

Measured: 4.174 V

Result: 4.174 V with the cell wired straight to the board. With a current meter in the battery lead the reading is about 15 mV lower; that is the meter wiring, not the charger.

Plan §REV-04 · board 2

Expected: < 30 mA (the charger stops at 7.5 % ≈ 23 mA)

Measured: 23 mA

Result: About 23 mA, 8 % of the charge current, as designed.

Plan §REV-05 · board 2

Expected: ≤ 85 °C

Measured: 55 °C

Result: About 55 °C while charging at 303 mA, well under the 85 °C limit.

Plan §REV-06

Expected: Record; ≤ 500 mA, else docs say 'use a ≥ 1 A charger'

Measured: 363 mA

Result: 363 mA while charging with Wi-Fi on, so a standard 500 mA USB port is enough.

Plan §REV-07

Expected: 0.20–0.40 mA (R34 10 kΩ)

Measured: 0.782 mA

Result: 0.78 mA, above the 0.20–0.40 mA target; see Findings. A flat battery left on the board reaches the protection cutoff in about 3–6 days, then draws about 1.2 µA.

Plan §REV-08 · board 2

Expected: ≥ 10 wakes in a row, no miss

Measured: 19 wakes

Result: 19 of 19.

Plan §REV-09 · board 2

Expected: Within ±3 dB

Result: No difference from V1.0 at the same spot.

Plan §REV-10

Expected: ≥ 13 h per 1000 mAh

Measured: 24.4 h / 1000 mAh

Result: 24.4 hours per 1000 mAh with Weather Clock 2.1 (45.5 hours on a 1.9 Ah cell, 41 mA average). With Wi-Fi always on, as in firmware 1.0: about 14–14.5 hours.

Plan §BAT-01 · board 2

Expected: Clean shutdown

Result: "Battery low" screen, then deep sleep. No reboots.

Plan §BAT-02 · board 2

Expected: Record (estimate 72–144 h at 0.78 mA)

Plan §BAT-03

Expected: Warn 3.45 V, cutoff 3.30 V ± 0.02 V

Measured: 3.298 V

Result: Warning at 3.45 V, shutdown at 3.30 V (measured 3.298 V at the battery connector).

Plan §FW-01 · board 2

Expected: Back to sleep every time

Measured: 6 of 6

Result: 6 of 6.

Plan §FW-02 · board 2

Expected: ≤ 10 min

Measured: 3.25 min

Result: 3 minutes after the charger stopped.

Plan §FW-03 · board 2

Expected: 4 bars when full; 0 bars only below 5 %

Result: 4 bars at 4.11 V after a full charge; 51 % and 3 bars at 3.87 V.

Plan §FW-04 · board 2

Expected: Every sync succeeds

Result: Every sync on battery succeeded, in 0.4–4.2 seconds.

Plan §FW-05 · board 2

Expected: All found; misspelled → setup reopens with a note

Result: New Orleans, a ZIP code, Houston + TX and Paris + TX all found; a misspelled city reopens setup.

Plan §FW-06 · board 2

Expected: 0 unexpected resets in ≥ 24 h

Measured: 0 resets

Result: No resets in a 45.5-hour run or a 15.7-hour overnight run.

Plan §FW-07 · board 2

Expected: "USB idle" within ~20 min

Plan §FW-08

Expected: ≤ +3 dB vs V1.0

Result: No difference from V1.0 in a near-field comparison. This is a pre-check, not a compliance test.

Plan §EMC-01

Expected: Works as on V1.0

Result: ESPHome 1.1.1 on a V2.0 board: entities in Home Assistant and both screens work. With Wi-Fi connected the whole time it ran 26.5 hours on a 1.9 Ah cell, about 14 hours per 1000 mAh. The low-battery warning, the shutdown 30 minutes later, the wake on USB and the return to sleep after a short plug-in all worked as designed.

Plan §ESP-01 · board 2

Expected: Done

Result: Firmware 2.1.6 and ESPHome 1.1.1 are published with the final settings, the documentation is updated, and this report is published.

Plan §DOC-01