Smart scale with e-paper display for 5 L jugs – TAL220 + NAU7802 + XIAO ESP32-C6 (ESPHome)
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WiFi scale for a 5 L jug, 2.13" e-paper shows the litres left. TAL220, NAU7802, XIAO ESP32-C6, ESPHome, Home Assistant.
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Informacje o modelu
- Źródło
- Printables
- Kategoria
- Electronics
- Licencja
- Open Community License v1.1 + General Attribution v1
WiFi scale that sits under a 5 L jug and shows the litres left on a 2.13" e-paper display, while sending mass and volume to Home Assistant. The display version of my nutrient-jug scale. Running under the nutrient jugs of my hydroponic setup.
Features
201 × 102 × 32 mm, one single shape: the sloped front carries the display
E-paper slides between two cheeks, the lid locks it in: no screws
Shows volume, a fill gauge, mass, WiFi and Home Assistant status; readable without power
NAU7802 held on four ribbed pins, XIAO held by a snap-in retainer, USB-C at the back
Snap-fit flush lid, magnets or screws underneath
Calibration from Home Assistant, no reflash
File | Notes |
|---|---|
base_ASA.3mf | bottom on the bed, no supports |
lid_ASA.3mf | already flipped, no supports |
tray_ASA.3mf | rim up |
spacer_8mm_ASA.3mf | 100 % infill, it carries the load |
xiao_retainer_ASA.3mf | on its side, as exported |
ASA, 0.2 mm layers, 4 perimeters, 40 % gyroid. Test pieces first: display mount, XIAO mount, NAU7802 pins, load-cell rail, magnet slot.
balance_ecran_assemblage.step: printed parts and magnets assembled, one named body each. Curved faces are faceted.
Hardware
TAL220 load cell 10 kg, Adafruit NAU7802 (4538), Seeed XIAO ESP32-C6
WeAct Studio 2.13" e-paper, black/white, with its 8-wire ribbon
Qwiic cable, 2 × M5×20, 2 × M4×20
4 magnets 19 × 9 × 4.6 mm, or 4 countersunk screws Ø 4 (optional)
USB-C cable + 5 V supply
Wiring
From | XIAO |
|---|---|
Qwiic red / black / white / yellow | 3V3 / GND / D4 / D5 |
Display VCC / GND | 5V / GND |
Display SCL / SDA | D8 / D10 |
Display CS / D/C / RES / BUSY | D7 / D9 / D3 / D2 |
Load cell red / black / green / white on NAU7802 E+ / E− / A+ / A−. The display SDA is SPI data, not I²C.
Firmware
balance-common.yaml.txt, balance-display.yaml.txt, balance-example.yaml.txt: ESPHome configuration, rename them to .yaml. Secrets: wifi_ssid, wifi_password, an API key. ⚠ After an OTA update, keep the board powered for 2 minutes, or it rolls back. ⚠ Keep GPIO14 low unless a u.FL antenna is plugged in.
License
Model: Open Community License v1.1 + GAtt. Firmware: MIT.