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docs: update Hardware_requirements

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Karl B 2020-04-24 19:03:32 +00:00 committed by Josh Stewart
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Hardware_requirements.md
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@ -2,7 +2,7 @@
title: Hardware Requirements
description:
published: true
date: 2020-04-24T18:02:14.410Z
date: 2020-04-24T19:03:28.430Z
tags: hardware, wiring
---
@ -21,6 +21,8 @@ Inputs
This is arguably the most important sensor for Speeduino to function correctly. The signal going to the Arduino must be a 0v-5v square wave series of pulses (shown below) representing teeth on a wheel running at crank (or cam) speed. Many Hall and 'opto' sensors meet this digital square-wave spec. If only a crankshaft trigger wheel is used (no cam signal), the crank wheel must have a 'missing' tooth in order to provide position information as well as the engine RPM. Tested missing-tooth wheels currently are 4-1, 12-1, 36-1 and 60-2.
For all timing signal parsing options see the [decoders](/decoders) page.
Alternatively (and necessary for full-sequential injection) an added cam signal with or without crank wheel missing teeth. These setups are indicated by the added "/x", such as 60-2/1, for a 60-tooth crank wheel, with 2 missing teeth, and a 1-tooth cam signal per cycle. Cam-speed missing-tooth wheels can also support semi and full-sequential.
VR (variable reluctance) sensors can also be used, however as the board does not contain any sort of signal conditioner to convert the sine wave (below) to the required square wave, an additional module will be needed. An 8-pin DIP socket is located on v0.3.x and v0.4.x series official boards for this purpose as IC3. The MAX9926 chip has been tested to work with most types of input signals, and is available from the [Speeduino Store](https://speeduino.com/shop/index.php?id_product=17&controller=product), however any similar module that outputs a 0v-5v square wave (LM1815, LM358, SSC/DSC, many OEM modules, etc.) should also work fine with VR sensor signals.