sensors in boxes
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@GuyP That looks pretty simple... what boot loader do you write? do you really remove the processor from the uno or did you make a dedicated one? do you use the minimal breadboard version? This system also has the upside of not having to deal with the irritating counterfeit or ch340 ftdi chips, so bonus points...
@Moshe-Livne When writing the boot loader you need to keep the uno chip in the board.
Once you've written all the board loaders, then you can pull the chip from uno and replace it with all the new ones to write the temperature sensor codes.
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@GuyP Cool thanks, Time to etch some boards, have you used this method/setup for other nodes? Just trying to get some ideas :grinning:
@DrJeff At the moment just temperature sensors.. however the plan is to also control my heating system around the house.
I will put putting controllers on all the radiators around the house, and replacing the controller in the house with simple radio buttons which feed back to openhab for manual over ride.
Just not had time yet! :(
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@DrJeff At the moment just temperature sensors.. however the plan is to also control my heating system around the house.
I will put putting controllers on all the radiators around the house, and replacing the controller in the house with simple radio buttons which feed back to openhab for manual over ride.
Just not had time yet! :(
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@GuyP Yes we always got to deal with real life! On the board I assume the red lines are wires due to the single sided board?
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I'm running everything at 3 volts from the 2 AAA batteries. The box is 3D printed and integrates the battery box. I'm not using any screws, just slide rails for the PCB , top and back.
I have two board types now. One with just the single Dallas temp sensor on it, which turns out to be what I need most of.
I also created another board which has three Connectors, JP1-3, which allows to additional Dallas Temp sensors. I have these in locations where I can run wires more easily, like my loft spaces.
I'm etching everything myself. Very simple really. I'm using the print on to glossy paper and transfer onto copper board, using a laminator, method. Works really well. As these boards are small I tend to etch a few at a time onto a single copper board and then cut the board at the end.
@GuyP can you please export it in brd or dxf?
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@GuyP Thanks!!!!
@GuyP Ordered 3 from oshpark... 12$. lets see how quickly they get here. so, other than the sensor and the resistors and oscillator (16mhz?) is there anything else there? I am sorry, I am just hopeless at reading sketchs. Is that a diod on the top left?
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Sorry my fault... I'm not very good at documentation! :(
There are no diodes on the boards... Which board are you referring to.. the TempSensor board just has:
- 1x dallas Tempensor
- 2x capacitors for the crystal
- 1x 16Mhz Crystal
- 1x 4.7uf Capacitor accros the power lines
- 1 resistor for the Dallas sensor to provide power
- 1x 470k resistor and 1x 1m resistor for the battery power level monitoring.
I don't even have the pins for updating the Arduino, I pull it from the socket and write it in a uno board. I do however have a GND, and serial TX pin so I can see the chip working if necessary.
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Sorry my fault... I'm not very good at documentation! :(
There are no diodes on the boards... Which board are you referring to.. the TempSensor board just has:
- 1x dallas Tempensor
- 2x capacitors for the crystal
- 1x 16Mhz Crystal
- 1x 4.7uf Capacitor accros the power lines
- 1 resistor for the Dallas sensor to provide power
- 1x 470k resistor and 1x 1m resistor for the battery power level monitoring.
I don't even have the pins for updating the Arduino, I pull it from the socket and write it in a uno board. I do however have a GND, and serial TX pin so I can see the chip working if necessary.
@GuyP excellent!! That comes out as a really inexpensive and low power board. What sockets do you use? will these work? http://www.aliexpress.com/item/Free-shipping-17PCS-28pin-DIP-IC-sockets-Adaptor-Solder-Type-28-pin-Narrow-body/32313568228.html?spm=2114.32010308.4.2.lkcXJR
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Yes it's very cheap and simple to build, When I was etching the boards I was etching 12 at a time and cutting them down.
That 28pin Narrow socket looks to be the right thing (seems to say the right things anyway), the graphic is odd though.
I also bought all the parts in bulk which made for even more savings, specially for resistors and capacitors where I bought maybe 100 and was paying less than 1p a unit.
I was also able to buy the Dallas Temp sensors in bulk and saved quite well on those as well
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Yes it's very cheap and simple to build, When I was etching the boards I was etching 12 at a time and cutting them down.
That 28pin Narrow socket looks to be the right thing (seems to say the right things anyway), the graphic is odd though.
I also bought all the parts in bulk which made for even more savings, specially for resistors and capacitors where I bought maybe 100 and was paying less than 1p a unit.
I was also able to buy the Dallas Temp sensors in bulk and saved quite well on those as well
@GuyP Yes, i think that they tried to show what chip fits the socket. They move in mysterious ways... I have all the transistors and capacitors i'll ever need (they are really cheap...) but ordered the oscillators so now I have to wait for a week or two. I am not into etching - seems like something I'll manage to mess up. oshpark will print nice pcbs for you for a really reasonable price. I have ordered only 3 so cost is 4$ each but if you order quantity its much much less (and most of the price is the shipping i think :-) ).
I also have some Dallas so I am all set. As I don't have a 3d printer but really good at woodworking I think i'll build some nice oak boxes for these.... -
Oh a few people have suggested these guys for cheap PCB production..
http://dirtypcbs.comI've not tried them myself yet.
@GuyP They are very cheap per board. Might give them a go if the 3 works fine. early days yet!
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@GuyP PCB arrived from oshpark!
What capacitors did you use for the crystal? and what resistor for the dallas? -
@GuyP It does... Now I realize that if I knew what I was doing (and I don't) it could probably be made smaller and no need for soldering at all.
Thanks! will let you know how it worked out. Might take a bit of time as I am now finishing my AirCon remote sensor.
