Public Lab Research note

This is an attempt to replicate an activity.

Idea for<$5 analog thermal fishing bob

by warren |

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Using 555 timers and no Arduino... Only red/blue LEDs!

water-quality thermal-fishing-bob thermal thermal-pollution open-water 555 analog heat



I take it the idea is to get the red/blue flashing really fast, making a gradient red-->magenta--->blue depending on the resistance of the thermistor in the 555 control circuit?

I like this a lot. Thermistors are non-linear in their response, so tuning this to different temperature ranges is going to require some thinking, but its a really excellent idea.

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