APT 2.0 Simon Dawes & Keith Rickard Update 2

Mission Control Monitor BBC Micro B computer (64K RAM) Two 5 1/4" floppy disk drives PMT pulse counters Stepper motor control box 900v DC power supply PMT amplifier and discriminator box Photomultiplier tube (PMT)

2.0 Architecture RPi (Master) RA Drive DEC Drive PMT Controller counter Arduino (Slave) Arduino (Slave) Keypad LCD Buzzer Blue = Complete! Yellow = Original (minor mods) The RPi and Arduinos will be powered by a USB hub

Hand Box 2x16 character LCD Buzzer Keypad (backlit) Red Light Torch Windows can talk to Handbox Linux work in progress (few bugs to iron out)

Software ~30% complete; 1700 lines of code Test / Proof of Concept Software WHORU test Handbox test Cross platform WHORU test

Demo!

PMT/Drive Arduino This Arduino counts pulses from the Photomultiplier Tube each time it is triggered by a photon. The final count is provided to the Raspberry Pi. Its other function is to send the necessary pulses to the telescope stepper motor drives under the control of the Raspberry Pi.

PMT/Drive Arduino A purpose built circuit board ('shield') has been built to carry out these functions. It also has a test mode and a PMT pulse emulator None of this has been tested. It will be checked out before powering it up to enjoy it going up in smoke! Once done, it will be tested directly with the APT

PMT/Drive Arduino

PMT pulse emulator buttons Counter chips Stepper motor test jumper PMT pulse connector Stepper motor emulator LEDs Stepper connector

PMT/Drive Arduino

74LS05 hex inverter chip between Arduino and Stepper Motor Control Boards

PMT/Drive Arduino Connectors for PMT lead and Arduino USB connector

PMT/Drive Arduino

End Questions?

Spiral Search Spiral Search routine built