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ATMega328p board w/ NRF24l01+ and Bluetooth module sockets

openhardware.io 17 May 2016, 10:45 last edited by openhardware.io 27 Jul 2016, 13:58

https://www.openhardware.io/view/98/ATMega328p-board-with-NRF24l01-and-Bluetooth-module-sockets
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@yveaux said in Ikea Molgan Hack: @magpern the instructions on openhardware.io state that the Molgan must be battery powered while programming: Well, then I can confirm that you don't have to power the Molgan from batteries just for programming. Burning the bootloader works fine with just power from the ISP port and programming it through FTDI works fine if power comes from the FTDI. What I found wierd is that the atmega328 had power, the radio had power, it wrote debug messages to the FTDI - when powered through the FTDI, it send radio messages etc, but it just did not receive messages. Messages where not received until I supplied power to the + / - pads (battery pads). I did read the instructions on openhardware.io, but I didn't follow then to the t.
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BTW, I like how you both made a case for it. Very nice!
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You would use PID if you have a temperature feedback from the rooms, but in your case you are not interested so it doesn't matter much. Sure turning off pump when not needed is a good thing. I have colleague that also bought a few netatmo devices to control floor heating of some zones of his house and he is very happy.
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The choice of MOSFET can be tricky. Seems that irlz44n was discontinued so you may need to find one adapted to the voltage and current you want to handle. In all the cases you need to get a logic MOSFET too, meaning that they are fully open usually around 1 to 3V. Also I'm sort of confused as it seems to me that L7812CV is a Voltage regulator, not a MOSFET. So if you are actually using that in the MOSFET spot it will definitively not work. Especially if you are handling high current or voltage I would recommend using one from a reputable source for your MOSFET, I recently switched from mouser / digikey / aliexpress to mostly use http://www.arrow.com as you get free regular shipping, event if you order a couple of components (no affiliation to them whatsoever).
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I look forward to seeing photos....
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Hi.... hehe... I must decode it from source code?? hmmmm... interesting... where I need to write my question? power down mode .. every 1 sec wake up .. using timer2 32kHy crystal 2.make sensor with more sensor type in one device .. for example .. temperature , energy meter, bin input state.. etc..
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