# Thermostat Main Module ## Description ESP8684H4 based thermostat module which will control the heater. The module will have 18650 Li-Ion battery cell with 3.7V nominal voltage. The module also has a switch-mode buck NVDC power path which can simultaneously charge the battery and provide power to the system. The system voltage is 3.3V. Input voltage is 5V from USB-C. The system also contains a temperature, humidity and pressure sensor. The Wi-Fi and Bluetooth antenna implemented by PCB tracks. ## Project Details - **Owner:** skriba91 - **Created:** 11/23/2024 - **Last Updated:** 11/24/2024 - **Visibility:** Public - **System voltage:** 3.3V - **Power Input:** 5V - **Battery nominal voltage:** 3.7V - **Antenna type:** PCB antenna - **Internal DC-DC regulator:** TPS62172 ## Key Components ### ANT1 — [PCB Antenna](https://www.flux.ai/collinsemasi/pcb-antenna~k5.md) - Part Type: Antenna - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - 1 [pin 1] - 2 [pin 2] ### U1 — [TPS62172QDSGRQ1](https://www.flux.ai/lcsc/tps62172qdsgrq1~slg2.md) - Package or Case Code: WSON-8_L2.0-W2.0-P0.50-TL-EP - Manufacturer Part Number: TPS62172QDSGRQ1 - JLCPCB Part Class: Extended Part - Manufacturer Name: TI(德州仪器) - LCSC Part Number: C2650337 - Part Type: DC-DC Converters **Pins:** - AGND [pin 4] - EN [pin 3] - EP [pin 9] - FB [pin 5] - PG [pin 8] - PGND [pin 1] - SW [pin 7] - VIN [pin 2] - VOS [pin 6] ### U3 — [ESP8684H2](https://www.flux.ai/lcsc/esp8684h2~uts1.md) - Manufacturer Name: ESPRESSIF(乐鑫) - JLCPCB Part Class: Extended Part - Part Type: RF Transceiver ICs - LCSC Part Number: C2922574 - Manufacturer Part Number: ESP8684H2 - Package or Case Code: VQFN-24_L4.0-W4.0-P0.50-BL-EP2.8 **Pins:** - ANT [pin 1] - CHIP_EN [pin 7] - EP [pin 25] - GPIO0 [pin 4] - GPIO1 [pin 5] - GPIO10 [pin 16] - GPIO18 [pin 18] - GPIO2 [pin 6] - GPIO3 [pin 8] - GPIO8 [pin 14] - GPIO9 [pin 15] - MTCK [pin 12] - MTDI [pin 10] - MTDO [pin 13] - MTMS [pin 9] - U0RXD [pin 19] - U0TXD [pin 20] - VDD3P3_CPU [pin 17] - VDD3P3_RTC [pin 11] - VDDA [pin 21] - VDDA [pin 24] - VDDA3P3 [pin 2] - VDDA3P3 [pin 3] - XTAL_N [pin 22] - XTAL_P [pin 23] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/skriba91/thermostat-main-module~hh](https://www.flux.ai/skriba91/thermostat-main-module~hh).* --- *Generated from [https://www.flux.ai/skriba91/thermostat-main-module~hh](https://www.flux.ai/skriba91/thermostat-main-module~hh)*