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m5stack_voltmeter_node

document
id 0x49
16-bit ADC conversion
0x53は絶対使うな、工場出荷時のきゃりぶれーしょん

$ sudo i2cdetect -y -r 1

reg_addr
getVoltage()
getConversion()
i2cReadU16(_ads1115_addr, ADS1115_RA_CONVERSION, &value);
i2cReadBytes(addr, reg_addr, read_buf, 2);

reg_addr : ADS1115_RA_CONVERSION 0x00
write(reg_addr)
requestFrom(addr, (uint8_t)len)
参考資料

133 : 10000101
131 : 10000011
: 10001001
133 : 10000100
131 : 10000011
1000010010000011 : 8483

1000010110000011
1000010110000011
34179 * 2 = 68358

レジスタアドレス
コンフィグアドレス:0b01

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