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💬 Secure 5-button Keyfob

openhardware.io 2 May 2017, 09:55 last edited by openhardware.io 27 Jun 2017, 09:27

https://www.openhardware.io/view/383/Secure-5-button-Keyfob
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mysensors 189 atsha204a 28 enclosure 5 keyfob 1
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NeverDie Hero Member 8 May 2017, 00:40 last edited by

I look forward to seeing photos....
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To provide a large enough pulse to drive the ceramic transducer , you need a lot of energy, so they pump up the 5v with an inductor/transformer to provide a high voltage pulse. This is 60v or more… The more Energy you produce the farther the pulse will travel…. Everything thing else on the board run at 3.3 to 5V. Add a large Capacitor of 100 µF are so between the 5v and ground on the device, this may clean up your problem.. Some CPU modules just can’t supply enough current quick enough that’s needed when the pulse is triggered. These are very inexpensive device, we’re luck to see them work at 1/2 the spec range.
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@Sunseeker According to the Connecting the Radio page, D2 is the default pin for the CE signal for the NRF24. If you'd like to use this pin for I2C, you can free it up by assigning a different pin for the CE signal by adding this line to your sketch: #define MY_RF24_CE_PIN pin IIRC, all available pins should work for this purpose (D0, D3, D4). Just pick one and if it doesn't work, use one of the other pins. Please make sure to add that line before #include <MySensors.h>.
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@fets So far, I have only built the 5x5 board (but the others should be schematically identical). The only issue I have found so far is that I cannot get the ISP port to work. But I have checked and I have an identical setup on the 1.0 board and that worked, so I suspect the programmer is too weak to drive the net on this one. So it is not a board-issue per se, and might only be an issue on the 5x5 board as routing is the most complex on that one due to the size.
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I'm wondering what the minimum input voltage is. The description only says max. 6.5V input voltage from the battery, but does not say what the minimum is. Both the nrf24l01+ as well as the atmega328P work with 3.3V, so if I use three AA batteries, that should be fine, right? I suppose using two AA batteries is not enough?
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Good job, what is your antenna on this pic ? https://www.openhardware.io/uploads/56f2b419b65656da7cacd69c/394/Gateway_ext.jpg
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@ricardot said in pimatic-mysensors controller plugin: @Dheeraj, Do you plan to continue to develop this plugin? I will very pleased to see a mysensors button. Thank you! I second this. And also see if we can lose the dependency on serialport 2.0.6 so that we can use Node.js > 4.9.1
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