Thanks Martin, I need to tell You this project is great I have a lot of fun making this. Here are my recent progress from yesterday.
Battery pack.I taken Li-ion cells from my faulty Dell Vostro 1500 battery, one cell died but all other are to good to throw them away so I decided to make my own battery pack.
Yes I know, soldering Li-ion cells is not good idea but I did it quick so they survived :-). Now I have battery pack with 8 cell in parallel 4.1V fully charged, capacity is about 14Ah maybe I should measure it with some constant load???
To charge this package easily, I have modified my TrustFire charger (from dx.com).
Step-up transformer - "the black box".Primary side : 20 turns R=0,5R
Secondary side: 200 turns R=5R
Ratio 10:1 (secondary:primary).
Core: EI Ferroxcube E22/15/6
http://www.ferroxcube.com/prod/assets/ei22156.pdfUnloaded secondary side can be dangerous (voltage peaks above 100V Vpp @ 1kHz)!
For switching mosfet I chosen MTP75N03HDL it is great logic level mosfet works nice with 4V Vcc (above 40A @ 3Vgs).
Anyway mosfet should have fast acting reverse polarity diode connected between drain and source.
Enclosure.To better performance I decided to use 4 piezo's to cover more space around unit, piezo's are angled down because "Portable Bark Killer" will be placed about 3m above earth level.
In enclosure I will place:
1x on/off switch
1x fuse holder
1x light sensor
1x led
1x DC jack as charge port
2x uSwitch
MCU and power.To meet requirements for low power I'm using one 1N4002 diode in series with 4V rail to drop 0.6V, MSP430 Vcc maximum is 3.6V so it's ideal solution.
Deep sleep modes in MSP reduces power consumption below 1mA, but of course this value will increase when I add RF and some simple "DSP" processing.
Planned features:
* automatic bark detection (it will be hard to implement)
* wireless control
* day/night detection
* battery voltage measurement
* statistics (no. of trigging's per day etc.)
* different frequencies and power (PWM)
* outside temperature measurement (msp430g2553 have integrated temp sensor)
One important notice this unit is extremely loud, during test at audible frequencies put on hearing protection, this isn't a joke.
P.S. I'm sorry for the mess in my garage, I need to change table mat for something better.









































