Espressif ESP32-C3-MINI-1
Wireless Multi-Point Temperature Monitor
Overview
A battery-powered, wireless multi-point temperature monitoring system utilizing DS18B20 sensors and a custom PCB for indoor HVAC and room monitoring.
Julius UheSystem architecture
MCU
SENSOR
POWER
- SENSOR_THERMAL → MCUGPIOShared 1-Wire data bus connected to a single MCU GPIO pin with a 4.7k ohm external pull-up resistor.
- POWER → MCUPowerProvides regulated 3.3V supply power to the ESP32-C3 MCU.
- POWER → SENSOR_THERMALPowerGated VDD power line controlled by MCU via a high-side P-channel MOSFET to eliminate sensor standby current during deep sleep.
- MCU → POWERGPIOMCU control signal to switch the high-side MOSFET for sensor power gating.
Bill of materials
| Part number | Type | Component | Manufacturer | Package | Qty | Datasheet | Match |
|---|---|---|---|---|---|---|---|
| ESP32-C3-MINI-1U-N4 | MCU | Espressif ESP32-C3-MINI-1 Main controller, handles Wi-Fi/BLE transmission, 1-Wire protocol communication, and deep sleep power management. | Espressif Systems | 53-SMD Module | 1 | Matched | |
16 alternatives consideredAI verified | |||||||
| MAX31850EVKIT# | SENSOR | Analog Devices DS18B20 Multi-point temperature sensing via 1-Wire bus topology deployed in rooms or HVAC ducts. | Analog Devices, Inc. | — | 4 | Matched | |
18 alternatives consideredAI verified | |||||||
| MCP73831 | POWER | Li-Ion Battery Power Subsystem with TP4056 and RT9013 Regulator Single-cell Li-Ion battery power source, USB-C linear charging, 3.3V voltage regulation, and high-side P-channel MOSFET power gating for DS18B20 VDD. | MICROCHIP | SOT-23-5 / DFN-8 | 1 | Matched | |
21 alternatives consideredAI verified | |||||||
Build guide
6-8 hoursIntermediate
1
Procurement & Preparation
- Procure all required BOM components including ESP32-C3-MINI-1U-N4 modules, DS18B20 temperature sensors, MCP73831 charging ICs, RT9013 LDO regulators, TP4056 modules, P-channel MOSFETs, custom PCBs, and 18650 Li-Ion batteries.
- Stencil solder paste onto the custom PCB pads using a stainless steel laser-cut stencil and manual squeegee applicator.
2
Hardware Assembly & Wiring
- Place surface-mount components including the ESP32-C3-MINI-1U-N4 module, MCP73831, RT9013, and high-side P-channel MOSFET power gating circuitry onto the pasted PCB using a pick-and-place machine or tweezers.
- Reflow the populated PCB through a multi-zone thermal reflow oven following the SAC305 lead-free profile.
- Solder the DS18B20 temperature sensors to the 1-Wire bus wiring harness, connecting DQ, GND, and the switched VDD_GATED power line.
3
Firmware Setup
- Connect the ESP32-C3-MINI-1 development programming interface to a host computer via USB-to-UART bridge.
- Compile and flash the firmware supporting ESP-IDF or Arduino IDE, configuring Wi-Fi/BLE credentials, 1-Wire protocol routines, and deep sleep power management intervals.
4
Testing & Calibration
- Perform a quiescent current and functional test using a digital multimeter to verify that deep sleep power consumption drops below target microamp thresholds when sensors are unpowered.
- Calibrate and validate multi-point temperature accuracy by exposing all connected DS18B20 sensors to a controlled thermal bath or reference chamber.
Document
multi-point temperature monitoring system
A battery-powered, wireless multi-point temperature monitoring system utilizing DS18B20 sensors and a custom PCB for indoor HVAC and room monitoring.
Design Overview
| Item | Details |
|---|---|
| Product Type | multi-point temperature monitoring system |
| Key Functions | Multi-point temperature sensing using DS18B20 sensors, Wireless data transmission via Wi-Fi or Bluetooth, Battery-powered operation with internal rechargeable battery, Custom bare PCB integration for indoor HVAC and room monitoring |
| Power Source | Li-Ion Battery |
| Connectivity | WiFi, Bluetooth |
| Size | Custom bare PCB for integration into existing hardware |
| Environment | indoor |
| Difficulty | Intermediate |
| Est. Time | 6-8 hours |
System Architecture
Power Topology: A single-cell Li-ion/LiPo battery (3.7V nominal) is connected to a TP4056 linear charging IC for safe USB-C recharging and feeds into an RT9013 low-dropout (LDO) regulator to produce a steady 3.3V rail for the ESP32-C3 MCU. The DS18B20 sensors' VDD line is powered through a high-side P-channel MOSFET switch controlled by the MCU to completely cut off sensor quiescent current during deep sleep cycles.
Module List
| Module ID | Type | Name | Function | Voltage |
|---|---|---|---|---|
| MCU | MCU | Espressif ESP32-C3-MINI-1 | Main controller, handles Wi-Fi/BLE transmission, 1-Wire protocol communication, and deep sleep power management. | 3.3V |
| SENSOR_THERMAL | SENSOR | Analog Devices DS18B20 | Multi-point temperature sensing via 1-Wire bus topology deployed in rooms or HVAC ducts. | 3.3V |
| POWER | POWER | Li-Ion Battery Power Subsystem with TP4056 and RT9013 Regulator | Single-cell Li-Ion battery power source, USB-C linear charging, 3.3V voltage regulation, and high-side P-channel MOSFET power gating for DS18B20 VDD. | 3.7V / 3.3V |
Key Components
3/3 modules matched to real parts. See the BOM tab for the full component table.
Espressif ESP32-C3-MINI-1 (ESP32-C3-MINI-1U-N4)
Candidate 1 (ESP32-C3-MINI-1U-N4) is an exact match for the searched part number, featuring the ESP32-C3 microcontroller
Li-Ion Battery Power Subsystem with TP4056 and RT9013 Regulator (MCP73831)
MCP73831-2ACI/MC is an exact component match for the searched Microchip linear Li-Ion charge management controller menti
Build Summary
- Difficulty: Intermediate
- Estimated time: 6-8 hours
- Tools required: Soldering iron, Reflow oven, Stencil printer, Digital multimeter, ESD-safe tweezers, Host PC with ESP-IDF
See the Build tab for the full step-by-step assembly guide.
Generated by YuanQi AI Design System · Query: Design a multi-point temperature monitoring system using DS18B20