- iButton probes come in many forms, some have LED-indicator(s) with one or two colors.
- iButton probes have at least two wires: a data line and a ground. Other wires are for indicator LED(s).
- iButton probes with two-color LED-indicator usualy have one bi-directional LED that changes color when polarity on two available LED-wires is reversed.
- On this page are some examples of iButton probes with their wiring. Wiring may vary for the model you receive.
No probe? No problemβ¦
iButton probes are essentially just connecting the two parts of an iButton cylinder to wires, so you can simulate a probe and setup like this:
- Connect the flat circular surface of the iButton to an Arduino digital pin, this is the 1-Wire data line.
- Connect a 2200 Ξ© to 4700 Ξ© pull-up resistor between the 1-Wire data line and Arduino 5V pin.
- Connect the side of the cylinder of the iButton to an Arduino ground (GND) pin.
Examples
Looks the same as one color model, see below. Different colors of LED-indicator by reversing polarity.
 |
Color | Function |
| Red | 1-Wire Data |
| Green | LED+ (red) / LED- (green) |
| Yellow | LED- (red) / LED+ (green) |
| Black | 1-Wire Ground |
Looks the same as two color model, see above.
|
Color | Function |
| Red | 1-Wire Data |
| Green | LED+ |
| White | LED- |
| Black | 1-Wire Ground |
 |
Color | Function |
| Green | 1-Wire Data |
| Black | LED+ |
| White | LED- |
| Red | 1-Wire Ground |
 |
Color | Function |
| Red | 1-Wire Data |
| Black | 1-Wire Ground |