Hello,
I see that you have a special post form someone but If you for reason change your mind I can help you build those devices.
I am planing to use a radio transmitter on 24Mhz or 433Mhz or eaven 2.4GHz because there are small and cheap, but not can not meat the 2$ per unit price piece. The smallest price that I cahce calculated is 5$.
About me:
I have 8 years of product design in the automotive industry. I am an expert in:
- Dc - Dc converters
- USB charging - accelerometers, gyroscopes
- GPS and GSM - LCD Displays
- LED power calculation
As a Layouter I have 5 Years experience. I am an expert in
: - Power Dissipation Calculation
- EMC Rules - Impedance Calculation
- Manufacturing Rules I have made Layout for ARM processor. Work also with BGA footprint. I have done projects even on 10 layer. So I know how to build a layer stack up.
As Layout and Schematic software I am an expert in Eagle, PADs, Zuken.
As Simulation software for the Schematic I used LTSpice.
If you want more information feel free to contact me.