Hw-133-v1.0 Datasheet May 2026

init_i2c();
write_register(0x00, 0x01); // release sleep
delay_ms(10);
id = read_register(0x01, 2);
if (id != EXPECTED_ID) error();

write_register(REG_ADC_START, channel);
delay_ms(2);
val = read_register(REG_ADC_RESULT, 2);
return convert_to_voltage(val);

The datasheet touts the capabilities of the HW-133 module, and here is how they hold up in reality:

| Feature | Hw-133-v1.0 | FC-28 | YL-69 | HL-83 | | :--- | :--- | :--- | :--- | :--- | | Comparator | LM393 | LM393 | LM393 | None (only analog) | | Potentiometer | Yes | Yes | Yes | No | | Analog Output | Yes (AO) | Yes (AO) | Yes (AO) | Yes (AO) | | Digital Output | Yes (DO) | Yes (DO) | Yes (DO) | No | | Typical Price | $1.50 | $2.00 | $1.80 | $1.00 | Hw-133-v1.0 Datasheet

The Hw-133-v1.0 is functionally identical to the YL-69 and FC-28. The "v1.0" primarily indicates the PCB layout revision. The datasheet touts the capabilities of the HW-133

If you want, I can: