The Lifex ESP32-Tux-Mini is a 20 × 20 mm ESP32-C3 development board built to make small-scale energy-harvesting experiments practical. Its reported power chain uses a small solar cell and a Texas Instruments BQ25504 circuit to charge a 3.7 V LiPo battery, which then powers the microcontroller. That is a useful maker project, not proof that the board can run indefinitely: published sources do not establish its runtime or harvesting performance.
What is the ESP32-Tux-Mini?
Lifex describes the board as an ESP32-C3 design created for a sensor cube. Hackster’s report describes its energy-harvesting circuit, while the seller listing documents its size and exposed connections. Together, these describe a compact development board aimed at experimenting with a battery-powered sensor project rather than a measured, finished energy-autonomous product.
According to the seller listing, the board measures 20 mm by 20 mm and includes USB-C for power and programming, nine GPIO pins, UART transmit and receive pins, ground, 3.3 V and 5 V pins, and an onboard WS2812B RGB LED. These are board-level features; the ESP32-C3 datasheet describes the chip, not every capability or electrical limit of the complete board. See the Lifex seller listing.
How the energy-harvesting power path works
- Harvesting source: A small solar cell supplies energy to the harvesting circuit.
- Energy conversion and storage: The circuit, reported to be built around Texas Instruments’ BQ25504, charges a 3.7 V lithium-polymer battery.
- Board power: The battery powers the ESP32-C3.
This separates the solar input from the microcontroller’s supply: the reported design stores harvested energy in a battery, then draws power from that battery to operate the board. Hackster reports that the BQ25504 can also be used with suitable harvesting hardware for sources such as RF, heat, or movement. Those are possible source categories for appropriately designed systems, not evidence that the Tux Mini directly accepts each source or has been tested with them. Read Hackster’s report on the board.
#1 Best Overall
- Entering download mode: Press and hold the BOOT button of ESP32C3, then press the RESET button, release the RESET button, and then release the BOOT button, at this time, ESP32C3 will enter the download mode. (You need to re-enter the download mode every time you connect, sometimes you press it once, the port is unstable and will disconnect, you can judge it by the port recognition sound)
What the ESP32-C3 contributes
The ESP32-C3 brings wireless connectivity and common microcontroller interfaces to the board. In Espressif Systems’ ESP32-C3 Series Datasheet v2.4, dated 2026-05-06, the chip is specified as a 32-bit, single-core RISC-V processor running at up to 160 MHz, with 400 KB SRAM, 2.4 GHz Wi-Fi, and Bluetooth LE. The datasheet also lists peripherals including UART, SPI, I2C, USB Serial/JTAG, and ADC. Consult the ESP32-C3 Series Datasheet for detailed chip specifications.
Espressif lists 5 µA deep-sleep power consumption for the ESP32-C3 chip. This is a chip-level datasheet figure, not a measurement of the Tux Mini as a complete board. Other board components and the project’s operating pattern matter when estimating power use, so this number alone cannot establish battery life.
Rank #2
- Flexible MCU Board: Incorporate the ESP32-C3 32-bit RISC-V chip, operating up to 160 MHz, mounted multiple development ports,
- Developer Friendly: Compatible with Arduino IDE, MicroPython, CircuitPython, PlatformIO, ESP IDF, Zephyr, Matter, ESPNow, Meshtastic, WLED, ESPHome, Home Assistant, Ubidots
- Outstanding RF performance: Complete Wi-Fi functions and Bluetooth Low Energy, while supporting communication over 100m with anFL antenna
- Elaborate Power Design: 4 working modes as low as 44 μA in deep sleep mode, while supporting lithium battery charge management
- Thumb-sized Design: 21 x 17.5mm, Seeed Studio XIAO series classic form factor
What is—and is not—established about energy autonomy
The maker’s stated goal was a sensor cube that would be “(more or less) energy independent.” The described solar-to-battery-to-board arrangement makes that a sensible experiment to pursue, but the available reporting and seller listing do not give a measured runtime, battery capacity, solar-cell rating, conversion efficiency, or autonomy result. Without those figures and the project’s workload and light conditions, it is not possible to determine how long the board would run or whether a particular installation could replenish its energy use.
For a meaningful evaluation, a builder would need to characterize the complete setup: the solar cell and its illumination, the battery and its usable capacity, the board’s consumption during active and sleep periods, and the sensor and radio workload. Those measurements would describe a specific build and conditions, not a universal runtime for the Tux Mini.
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1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minuteRank #3
- ❃❃The ESP32C3 SuperMini is positioned as a high-performance, low-power, cost-effective iot mini development board for low-power iot applications and wireless wearable applications
- ❃❃ESP32-C3 is equipped with a single-core 32-bit RISC-V processor, with a four-level pipeline architecture, with a main frequency of up to 160 MHz. ESP32-C3 has 400 KB of built-in SRAM and 384 KB of ROM storage space. ESP32-C3 is the industry-leading Wi-Fi+Bluetooth LE integrated solution
- ❃❃The EPS32-C3 is a cost-effective and low-power dual-mode Wi-Fi and Bluetooth chip. The ESP32-C3 uses a RISC-V processor, a single-core processor with a main frequency of 150 MHz, which integrates Wi-Fi 4 and Bluetooth 5.0 wireless communication.
- ❃❃【Software development support】C/C++/ESP-IDF-VSCODE/MICROPHYTHON. Second development of Aolt monitoring, video, photography and other applications. Wireless communication solutions
- ❃❃ESP32-C3 is a system-level chip (SoC) MCU with very low power consumption and high integration, which integrates 2.4Ghz Wi-Fi and Bluetooth (Bluttooth) low-end dual-mode wireless communication. consumption.
Design files and availability
Hackster’s report says the PCB design files were released under GNU GPL version 3 and points to a maker sales channel. Treat that as information about the reported release: confirm the terms and files from the current project source before reusing a design. The seller listing is the source for the board’s current commercial information; stock, price, and shipping terms can change. Check the current ESP32-Tux Mini listing.
Quick Recap
Best Value
- High Performance RISC-V Processor - Equipped with a 32-bit ESP32-C3 chip, 160MHz clock frequency, FPU floating-point unit and 400KB SRAM, ideal for efficient IoT development.
- Dual-Mode Wireless Communication - The ESP32-C3 supports 2.4GHz Wi-Fi (802.11b/g/n) and Bluetooth 5 (LE) with 400KB internal SRAM, 384KB ROM storage and 4MB onboard flash memory.
- COMPACT DESIGN & MULTIPLE INTERFACES - ESP32-C3 mini development board features 11 PWM GPIOs, 4 ADCs and UART/I2C/SPI interfaces and is compatible with various sensors and wearables.
- Extremely Low Power Consumption - The ESP32-C3 SuperMini is a powerful, low-power and cost-effective IoT mini development board, ideal for low-power IoT applications and wearable wireless applications. The deep sleep mode consumes only 43 µA and is therefore ideal for projects with long-term battery operation.
- Secure Encryption Support - Hardware accelerated AES/RSA/HMAC encryption, supports Secure Boot to ensure data security.
Rank #4
- The ESP32-C3 SUPERMINI is positioned as a high-performance, low-power, cost-effective IoT mini development board, suitable for low-power IoT applications and wireless wearable applications
- It is equipped with a rich set of interfaces, including 11 digital I/Os that can be used as PWM pins and 4 analog I/Os that can be used as ADC pins.
- It supports four serial interfaces, including UART, I2C, and SPI.
- The ESP32-C3 features a 32-bit RISC-V CPU, including an FPU (Floating Point Unit) capable of 32-bit single-precision
- Package: 2PCS ESP32-C3 MINI Development Board ESP32 SuperMini ESP32 C3 WiFi Module
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