Vehicle Battery monitor on a automotive relay form factor

Jesus Echavarria has tipped us with his latest project. A car battery monitor in a Relay form Factor. Unfortunately only hardware details are given and no details on software. He writes:

Hi all! I’m really busy this year so I can’t post all the projects where I’m involved. Here’s one of the design I do last year for a client. He wants to measure the voltage of a car battery and set a couple of alarms when voltage falls below a defined values. Also, he wants to put the device in the relay box of the car, so the design needs to have a relay form factor to easy integration. So, after a couple of iterations, here’s the final design of the battery monitor.

The project start around a year ago. The client wants a device to integrate in the relay box of some vehicles to monitor the voltage of the battery (12V nominal value). He wants two alarms at two different voltages. The alarm output will activate other external relays for advertising the low level of the battery, so I use a couple of small SSR for this outputs. Also he wants to configure the time to enable / disable alarms: once the device detect a voltage lower or higher than configurated values, the device needs to wait some time (configurable) before actívate or desactivate the alarms.

Vehicle Battery monitor on a automotive relay form factor – [Link]

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