sensors in boxes
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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.
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