# Vial Board

## Version D

<figure><img src="https://3394537773-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FYy5AdmKzUTn7D8n357Md%2Fuploads%2F6JQO0lnGgK4isqOJ3l4v%2Fimage.png?alt=media&#x26;token=6c9d83ee-e2b9-425a-a4ca-992ee96cda78" alt=""><figcaption><p>Picture of version D vial board in KiCAD</p></figcaption></figure>

### Pin Map

*Differences to Version C bolded*

1. Fan
2. Unused; linked to fan for future fan tachometer
3. Heating resistor
4. Thermistor
5. OD IR LED
6. **OD 135 photodiode**
7. **OD 90 photodiode / Spare A**
8. Spare B

<figure><img src="https://3394537773-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FYy5AdmKzUTn7D8n357Md%2Fuploads%2FKaOmxD7xsOCAvv1E78J0%2Fimage.png?alt=media&#x26;token=2ff85f46-cc73-4838-9c80-0084e4c8b783" alt=""><figcaption><p>Differences to vial board revision C inside box.</p></figcaption></figure>

## Version C

<figure><img src="https://3394537773-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FYy5AdmKzUTn7D8n357Md%2Fuploads%2FjRjTzrUGPDjFgJhsz7fx%2Fimage.png?alt=media&#x26;token=a5674afc-8bbd-413e-9c9a-3e077d1c11c8" alt=""><figcaption><p>Picture of version C vial board in KiCAD</p></figcaption></figure>

### Pin Map

*Differences to Version D bolded*

1. Fan
2. Unused; linked to fan for future fan tachometer
3. Heating resistor
4. Thermistor
5. OD IR LED
6. **OD 90 photodiode**
7. **OD 135 photodiode / Spare A**
8. Spare B

<figure><img src="https://3394537773-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FYy5AdmKzUTn7D8n357Md%2Fuploads%2FYWt8IPG94NuEvRJ0NpSV%2Fimage.png?alt=media&#x26;token=de7d0b22-4910-4c5f-a934-fe3c02e84c32" alt=""><figcaption><p>Differences to vial board revision D inside box.</p></figcaption></figure>