How well does this unit work for a range between 0v to 1v dc?

It divides by 5. if all you need is a reading of 0 to .2v than it would work.

Does this sensor work with a raspberry pi zero? i need to sense ac voltage (on/off). do you guys have anything maybe with an opto isolater

Sorry, for raspberry pi zero, you can not use this voltage sensor, you can use Voltage transformer module and ADS1115 module.

Does this sensor work with a raspberry pi 4 b? thank you.

It is a Voltage divider of resistors that divides by 5. 25v in gives 5 v out for a input to a port that needs to measure voltage. I needed it for an Arduino, but you can also use it on a Raspberry Pi. It is only a voltage divider. You could make your own with 2 resistors, that's all that is on the sensor. I just didn't want to look around when a unit with the resistors readily available.

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Description

⚡ Empower your DIY electronics with precision voltage detection!

WIDE INPUT RANGE - Supports DC voltages from 0 up to 25V, perfect for diverse Arduino and Raspberry Pi projects.
BULK PACK ADVANTAGE - Get 5 modules in one pack—ideal for multi-project setups or team collaborations.
RESISTIVE DIVIDER DESIGN - Safely scales input voltage 5x down to Arduino-compatible levels, protecting your board.
PLUG PLAY COMPATIBILITY - Seamlessly integrates with Arduino and Raspberry Pi analog inputs for rapid prototyping.
PRECISION VOLTAGE SENSING - Detect voltages as low as 0.02445V with ultra-fine resolution for flawless readings.

The Stemedu DC0-25V Voltage Detection Module is a 5-pack sensor set designed for Arduino and Raspberry Pi users, featuring a resistive divider that scales input voltage by 5x to safely measure up to 25V DC. It offers a high analog resolution of 0.00489V and can detect voltages as low as 0.02445V, making it ideal for precise voltage monitoring in diverse electronics projects.

Specifications

ASIN	B07L81QJ75
Best Sellers Rank	#292,570 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #69 in Sensor Blocks
Date First Available	January 16, 2019
Is Discontinued By Manufacturer	No
Item Weight	0.704 ounces
Item model number	ST0430X5
Manufacturer	Stemedu
Package Dimensions	6.5 x 4.09 x 0.98 inches

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