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Greetings gentlemen, I just serviced the distributor of my project A72 and wanted to check and adjust the ignition advance curve. At minimum I needed a timing light and a dwell angle meter. As expected, decent tools are expensive. So, here I am looking for a cost effective solution to buying a bunch of speciality tools. Since Arduinos are (relatively) cheap, have sufficient processing power, and has a lot of sensors, I'm trying to make some car diagnostic kit based on Arduino. Disclaimer- With global supply chains down, it will be some time before there is any significant progress in making this. For the time being I'm using this as a note to self and thinking out loud with the hope that experienced AL members would help me realize this project. Intended use I'm building it to use on my 1970's Lancer project car. The goal is to make a cost effective, easy to build, and reliable (for personal use) toolkit for cars of the era with similar technology. This will include most petrol cars with distributor driven ignition system. Once this takes off, I will make everything free and open source for anyone to replicate. Requirements 1. Timing light 2. Tachometer 3. Dwell angle meter 4. Vacuum gauge 5. Exhaust gas analyzer a la emissions test 6. Lambda sensor 7. Compression tester Construction Using Arduino as the brains of the toolkit, peripherals like led light, induction clamp, pressure sensors and gas sensors will be hooked up to it depending on the scenario. It will be connected to a computer over serial where all the input can be displayed. Real time data will be displayed with options to record, analyze, manipulate and share data with Matlab. 1. Timing light A ferrite core with a few windings is placed on the first high tension lead. After monitoring the behavior of the induced voltage with the serial plotter, mathematically determine when to fire the LED to give accurate timing. Consider any delays in the setup and hard code the lines to fire the LED at the correct time. Problems- High induced voltage can fry the arduino. How to control a high wattage LED to give the correct strobe frequency? How fast can the arduino respond? How to address any delays? 2. Tachometer Use the same input as for the timing light. Find the frequency high tension lead is fired. RPM is twice that. Problems- same as above. How to cancel noise from other HT leads? 3. Dwell angle meter A crocodile clip on the contact points with a large resistor in series could pickup the duration the contacts closes. Together with RPM the duty cycle can be calculated. Mathematically determine the dwell angle from the duty cycle. Problems- Will the capacitor mess with it? Protection from any voltage spikes during opening and closing? 4. Vacuum gauge Sensors are pretty cheap. Adapt it to plug in to a vacuum hose. Problems- Range, accuracy and sensitivity? will it respond quickly as analog ones to give real time data? 5. Exhaust gas analyzer Carbon monoxide and hydrocarbon sensors are available. SL emissions tests look only for those two. Temperature and nitrous oxide testing can be added. Problems- Range, accuracy and sensitivity? (will not give real time data because of the design of these sensors. That's alright.) 6. Lambda sensor These wideband oxygen sensors are available off the shelf. problems- Cost. Reliability, accuracy and range. 7. Compression tester Tiny pressure transducers are cheaply available. Can drill out old spark plugs, mount the transducer and seal it. Can make 4 and run simultaneous compression tests on all 4 cylinders. problems- Range, accuracy and precision. Will data be real time? at least all four in sync with time?