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Workshop 03: Input and Write

This workshop is about writing to the chain. You will read temperature and humidity from an AHT10 sensor, post the readings to a Node.js API, and use Mesh SDK with the Koios provider to turn each reading into a Cardano transaction - and eventually into an NFT.

Source code: github.com/CardanoThings/Workshops/tree/main/Workshop-03

Steps​

  1. Connect and Read Sensor Data - Wire an AHT10 over I2C, read temperature and humidity, optionally render them on a small SH1106 OLED.
  2. Build your own API to put data on-chain - A Node.js + Express server that uses Mesh and Koios to fetch wallet balance and submit transactions with sensor data attached as metadata.
  3. Mint Sensor Data on-chain - Mint each sensor reading as an NFT using the CIP-25 metadata standard. Includes burning.

What you'll need​

  • Everything from Workshops 01 and 02.
  • AHT10 temperature and humidity sensor (or compatible I2C sensor).
  • Optional: 1.3" SH1106 OLED for on-device display.
  • Node.js 14+ and a Cardano testnet wallet with some tADA for transaction fees.

Adapted from the CardanoThings workshop series, originally produced under Project Catalyst Fund 11. Source code: github.com/CardanoThings/Workshops/Workshop-03.