unmaintained
Sorry but I cannot take time to maintain the library now...
web3-arduino
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What is this library?
- This is an Arduino (or ESP32) library to use web3 on Ethereum platform.
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What is Arduino?
- Arduino is an open source computer hardware and software.
- https://www.arduino.cc/
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What is ESP32?
- ESP32 is a series of low cost, low power system on a chip microcontrollers with integrated Wi-Fi and dual-mode Bluetooth.
- https://www.espressif.com/en/products/hardware/esp32/overview
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What is web3?
- Web3 is the Ethereum compatible API which implements the Generic JSON RPC spec. Originally Javascript version is developed.
- https://github.com/ethereum/web3.js/
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What is Ethereum?
- Ethereum is a decentralized platform for applications that run exactly as programmed without any chance of fraud, censorship or third-party interference.
- https://www.ethereum.org/
Environment
- Confirmed device
- ESP-WROOM-32
- Used Ethereum client
- INFURA (https://infura.io)
Installation
- download the zip file from
Clone or downloadbutton on Github. - launch Arduino IDE.
Sketch->Include Library->Add .ZIP file-> select downloaded zip file.- Then you can use this from Arduino IDE.
Example
Please refer examples directory.
setup
#define INFURA_HOST "rinkeby.infura.io"
#define INFURA_PATH "/<YOUR_INFURA_ID>"
Web3 web3(INFURA_HOST, INFURA_PATH);call web3 methods
char result[128];
web3.Web3ClientVersion(result);
USE_SERIAL.println(result);
web3.Web3Sha3("0x68656c6c6f20776f726c64", result);
USE_SERIAL.println(result);call to Contract
Contract contract(&web3, CONTRACT_ADDRESS);
strcpy(contract.options.from, MY_ADDRESS);
strcpy(contract.options.gasPrice,"2000000000000");
contract.options.gas = 5000000;
contract.SetupContractData(result, "get()");
contract.Call(result);
USE_SERIAL.println(result);sendTransaction to Contract
Contract contract(&web3, CONTRACT_ADDRESS);
contract.SetPrivateKey((uint8_t*)PRIVATE_KEY);
uint32_t nonceVal = (uint32_t)web3.EthGetTransactionCount((char *)MY_ADDRESS);
uint32_t gasPriceVal = 141006540;
uint32_t gasLimitVal = 3000000;
uint8_t toStr[] = CONTRACT_ADDRESS;
uint8_t valueStr[] = "0x00";
uint8_t dataStr[100];
memset(dataStr, 0, 100);
contract.SetupContractData((char*)dataStr, "set(uint256)", 123);
contract.SendTransaction((uint8_t *) result,
nonceVal, gasPriceVal, gasLimitVal, toStr, valueStr, dataStr);
USE_SERIAL.println(result);