I soldered the entire board newly, and now it works fine.
Today or tomorrow, I'll be testing it with the heating resistances and an empty petri dish.
Questions: Do you think, I could sell them? (Of course, it will need a testing period prior to selling, to fix bugs and make sure it's safe)
To make a few bucks profit, I'd need to sell a construction kit for a bit more than 20€. Say 25. (I keep looking for cheaper parts, although here they are already quite as cheap as possible) . Soldered versions may cost additional 10€, but they are 'plug-and-play' things.
Professional incubators cost around (at least, I think) 1000€. On ebay you will get one for >50. (I wanted to buy one for 20€ and was the highest bidder for the longest time, but in the last seconds, one threw in 85€! and there was a fight and it came to ~120€s!)
My incubator has just 1 Watt for heating ( I could produce 2W 'quite' easily - and with more expensive relaises, 10W and more.) , but for small volumes, that should be enough to provide enough heat if you don't open the incubator so that warm air can escape.
When you pre-heat it with a hair-dryer to working temperature, you can cut pre-heating phase to some seconds (vs. many minutes without).
It has to be said that this is only the electronic board for an incubator, you need to get a polystyrene box or an insulated cooling box or a big coffee cup.
What do you think?? Would you buy such a thing?
My motives are that I can help others buy providing them with as-cheap-as-possible-incubators, and get some funding for my own biology work/research...
The code is open source, because I like the idea of open source ;)
Be honest :D
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