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Updating README.md to always use latest version of the circuit diagram image

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JayWll 2020-01-04 12:10:05 -07:00
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README.md
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@ -16,7 +16,7 @@ How Does It Work?
The hardware is built around a NodeMCU, which is an Arduino-compatible microcontroller with integrated WiFi. This is connected to a simple analog soil moisture sensor that's inserted into the soil itself. The moisture sensor came with a little circuit to convert the analog signal to a digital one, but it never worked so we threw it away.
![Circuit Diagram](https://cdn.glitch.com/b28f7cff-6fcc-4477-9f53-58cfa415c1e0%2FMoisture%20Sensor.png?v=1578163557215)
![Circuit Diagram](https://cdn.glitch.com/b28f7cff-6fcc-4477-9f53-58cfa415c1e0%2FMoisture%20Sensor.png)
The arduino code takes a reading every hour and sends it to the app on Glitch, where it gets stored in a SQLite database. Once a week a cleanup job is triggered by [cron-job.org](https://cron-job.org) to remove readings older than 90 days from the database.