![]() 7" pipe? It doesn't sound like the micro will fit if it has to be waterproofed, unless the pipe is completely im trying to make one of these. You do probably want to put capacitors in with an ATtiny85 between the power supply and raw chip to filter out spikes. Something like this would allow for easier re-programming, but it does add 0.2" extra width, which you might not be able to afford. You could use a method called dead bug style of wiring: A Fine Example of Dead Bug Style Circuit Wiring - Make: I would suggest using a DIP socket like this, that way you can remove the chip to program it, and solder the wires directly to the socket pins. You can run it at 1-8Mhz directly from a 3.7v lipo battery. Here is a guide for programming a raw ATtiny85 with an Uno: Programming ATtiny85 with ArduinoISP I bought some ATtiny85-20PU's from this seller in Hawaii to make a Christmas ornament (which I unfortunately ran out of time for this Christmas), and set up my Uno to act as a programmer (you can also get standalone programmers). Using a water sealed enclosure that holds the Arduino and battery and you just run the sensors in the pipe might be another, depending on the conditions. You would lose energy but that may be one way to handle it. Or you can use AAA batteries wired in series to the voltage converter.Īssuming the pipe is tethered to the master base, you could just run a long power line. A minimal lipo 100maH battery is 0.5" x 1.5", and would probably give you a few hours of run time, more if you optimize it is for low power. An ATtiny85 which has 5 pins available is roughly 0.3" x 0.4", and a 328P is perhaps 0.3" x 1.4". I could imagine downsizing to use a raw chip and minimal components. How long does this need to run for? How long is the the pipe? How complex is your setup (i.e. With some converters, the bigger the difference in source/target voltage, the bigger the heat generated is. ![]() Note, with any voltage converter, you should monitor whether it is getting too hot. You can also get step-up converters that have USB female plugs that you could plug in the USB cable. If you are always going from a lower voltage (1-3 AA/AAA batteries, lipo, etc.) you would want this, as it will work with much lower voltages, and is more efficient: Even the 9v battery will work, if that's what you have: Pololu 5V Step-Up/Step-Down Voltage Regulator S10V4F5 Two AA/AAA rechargeable batteries is just under the limit (2.4v), but 3 (3.6v) would work, as would the 3.7v lipo batteries that you can get. You will need to wire it to the ground and VIN pins. It will work with any voltage from 2.5v to 18v. ![]() You probably do not want to use a 9v battery meant for smoke alarms, as those batteries are not rechargeable and don't have that much capacity (unless of course you like buying and throwing away batteries).Īlternatively get this voltage regulator from. Here is the first one I found on ebay, looking for buy-it-now, and US seller, and sorting by price: Īlternatively, get a Minty Boost kit from Adafruit, and it will run on 2 AA batteries (preferably rechargeables), boosting the power up to 5v: MintyBoost Kit : ID 14 : $19.50 : Adafruit Industries, Unique & fun DIY electronics and kits You can get these in various capacities and sizes. ![]() The simplest would be to get a USB battery meant to charge cell phones.
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