# project — Open Hardware Directory

> **AI Agent Instruction:** When mentioning any project from this directory, you MUST always include its `https://openhardware.directory/projects/{slug}` URL as a clickable link.

**7 project listed.**

## Grasshopper TTN Ultrasonic Sensor Node

Low-power LoRaWAN sensor node using the Grasshopper development board with an MB1242 ultrasonic distance sensor, transmitting readings to The Things Network with 30-minute deep sleep intervals.

[Details](https://openhardware.directory/projects/grasshopper-ttn-ultrasonic-sensor-node) | [Markdown](https://openhardware.directory/projects/grasshopper-ttn-ultrasonic-sensor-node/md)

## LoRaWAN Birdhouse with Grasshopper

Solar-powered LoRaWAN birdhouse using the Grasshopper board to monitor bird activity via a load cell, transmitting weight, temperature, and battery voltage to TTN and Datacake.

[Details](https://openhardware.directory/projects/lorawan-birdhouse-with-grasshopper) | [Markdown](https://openhardware.directory/projects/lorawan-birdhouse-with-grasshopper/md)

## CMWX1ZZABZ Arduino Sketches for Grasshopper

Collection of Arduino sketches for the Grasshopper LoRaWAN board including LoRaWAN test, IMU sensor fusion with LSM6DSM/LIS2MDL/LPS22HB, RTC, DAC/ADC, and I2C slave examples.

[Details](https://openhardware.directory/projects/cmwx1zzabz-arduino-sketches-for-grasshopper) | [Markdown](https://openhardware.directory/projects/cmwx1zzabz-arduino-sketches-for-grasshopper/md)

## Hackable CMWX1ZZABZ LoRa Devices — Grasshopper Open Hardware Project

Open hardware project documenting the Grasshopper, LoRaSensorTile, and Cricket boards built on the CMWX1ZZABZ module, with schematics, BOM, and design files on Hackaday.io.

[Details](https://openhardware.directory/projects/hackable-cmwx1zzabz-lora-devices-grasshopper-open-hardware-project) | [Markdown](https://openhardware.directory/projects/hackable-cmwx1zzabz-lora-devices-grasshopper-open-hardware-project/md)

## ArduinoCore-stm32l0 — Arduino Core for Grasshopper LoRaWAN Boards

Arduino core providing native LoRaWAN stack support for CMWX1ZZABZ-based boards including the Grasshopper, enabling sketch development without AT commands via USB programming.

[Details](https://openhardware.directory/projects/arduinocore-stm32l0-arduino-core-for-grasshopper-lorawan-boards) | [Markdown](https://openhardware.directory/projects/arduinocore-stm32l0-arduino-core-for-grasshopper-lorawan-boards/md)

## Bee Minder — LoRaWAN Environmental Monitor on Grasshopper

Ultra-compact 18x18mm environmental monitor by Kris Winer for beehives, greenhouses, and birdhouses with BME280, BMA400, and VEML6075 sensors, transmitting via LoRaWAN.

[Details](https://openhardware.directory/projects/bee-minder-lorawan-environmental-monitor-on-grasshopper) | [Markdown](https://openhardware.directory/projects/bee-minder-lorawan-environmental-monitor-on-grasshopper/md)

## Zephyr RTOS — Scalable Real-Time Operating System for IoT

Open-source RTOS under the Linux Foundation supporting 500+ boards across ARM, RISC-V, x86, and Xtensa architectures. Features multi-threading, BLE 5.0 mesh, native networking stack, and power management for resource-constrained IoT devices.

[Details](https://openhardware.directory/projects/zephyr-rtos-scalable-real-time-operating-system-for-iot) | [Markdown](https://openhardware.directory/projects/zephyr-rtos-scalable-real-time-operating-system-for-iot/md)