1. INEXPENSIVE DIGITAL AZIMUTH READOUT Challenge Paul Wade W1GHZ

2. Digital Electronic Protractor 0 to 360° $16.95 igaging.com

3. Adaptable for Portable Microwave but What about Remote Readout? Inexpensive digital levels have been hacked for remote readout Inexpensive digital calipers have RS-232 output – Connect to Arduino for Bluetooth connection to smartphone – www.yuriystoys.com – Other digital indicators as well – (DRO)

4. Digital Caliper from Harbor Fright

5. Let’s take apart a Protractor

6. Held together by two small roll pins - gently pry apart

7. Unscrew electronic module

8. Top of PC board

9. Bottom of PC board

10. Bottom closeup

11. Summary No obvious external connection points Chip is under black glop Indicator is pair of PC rotating patterns No contacts – capacitive coupling? Binary pattern easily discerned from patterns Can it be hacked? – Steal digital from LCD? – Connect directly to rotating patterns?

12. Challenge Inexpensive digital remote readout for azimuth would be really useful for EME and microwaves Some of you have more expertise with microprocessors (PIC, Arduino, RaspberryPi, etc) Make one work and make plans available, and I will reimburse parts expense And you will be famous