Heltec HT-CT62
Ultra-compact ESP32-C3 + SX1262 LoRa/LoRaWAN module with WiFi and BLE, designed for SMT integration into IoT devices. Features 10uA deep sleep, +21dBm TX power, and Meshtastic compatibility in a tiny 17.78mm stamp-hole package.
$6.90
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Specifications
Components
Espressif ESP32-C3FN4 single-core RISC-V RV32IMC microcontroller at 160MHz with 400KB SRAM, 4MB SiP flash, WiFi 802.11 b/g/n, BLE 5.0, and hardware cryptographic acceleration (AES/SHA/RSA/HMAC/ECDSA).
Semtech SX1262 LoRa transceiver supporting 150–960MHz frequency range with +22dBm maximum output power, -134dBm sensitivity, and TCXO for stable frequency reference. Supports LoRa and FSK modulation.
Bus Interfaces
GPIO Map
Overview
The Heltec HT-CT62 is an ultra-compact LoRa/LoRaWAN node module combining the ESP32-C3FN4 RISC-V microcontroller with a Semtech SX1262 LoRa transceiver in a tiny 17.78 x 17.78mm stamp-hole package. Designed for SMT integration into custom PCBs, the module provides dual-mode wireless communication — 2.4GHz WiFi/BLE via the ESP32-C3 and long-range sub-GHz LoRa via the SX1262 — making it ideal for IoT sensor networks, Meshtastic mesh nodes, and LoRaWAN endpoints.
The module achieves remarkable power efficiency with just 10uA deep sleep current, while delivering +21dBm LoRa transmit power and -134dBm receiver sensitivity for multi-kilometer range. Two IPEX 1.0 antenna connectors provide separate RF paths for WiFi and LoRa, ensuring optimal impedance matching and RF performance. The 1.27mm pitch stamp-hole edge design enables reliable automated soldering in production environments.
At approximately $6.90 USD, the HT-CT62 is one of the most affordable ESP32+LoRa modules available, which has made it popular in the Meshtastic community for building low-cost mesh networking nodes. Community projects like CheapMesh and SolarMeshtasticNode demonstrate the module's versatility as a building block for off-grid communication devices, solar-powered remote sensor nodes, and compact LoRa repeaters.
Use Cases
8LoRa Mesh Networking
Building off-grid mesh communication networks using LoRa radio for text messaging, location sharing, and sensor data relay without cellular or internet infrastructure.
Off-Grid Communication
Text messaging and data exchange in areas without cellular or internet coverage.
LoRaWAN Node
A LoRaWAN end device that transmits sensor data to a LoRaWAN gateway for long-range, low-power IoT applications.
IoT Sensor Node
Compact wireless sensor node for collecting and transmitting environmental or industrial data.
Wireless Sensor Node
A compact wireless device that reads sensor data and transmits it over WiFi or other radio protocols to a central hub or cloud service.
Smart Agriculture
Enables precision farming through remote sensor monitoring of soil, weather, and crop conditions over LoRaWAN networks.
Remote Sensor Nodes
Deploy wireless sensor nodes in remote locations using LoRa, NB-IoT, or cellular connectivity.
LoRa Telemetry
Telemetry data transmission using LoRa radio for remote sensor monitoring.
Resources
Explore more of the directory — popular use cases, firmware, and specs to browse next.
