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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.

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APT 2.0


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apt 2 0

APT 2.0

Simon Dawes & Keith Rickard

Update 2

mission control
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
2.0 Architecture

Controller

RA Drive

  • Blue = Complete!
  • Yellow = Original (minor mods)

Arduino(Slave)

DEC Drive

counter

PMT

RPi(Master)

Arduino

(Slave)

Keypad

The RPi and Arduinos will be powered by a USB hub

LCD

Buzzer

hand box
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
Software

~30% complete; 1700 lines of code

Test / Proof of Concept Software

  • WHORU test
  • Handbox test
  • Cross platform WHORU test
pmt drive arduino
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 arduino1
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 arduino3
PMT/Drive Arduino

Stepper connector

PMT pulse emulator buttons

Counter chips

Stepper motor test jumper

PMT pulse connector

Stepper motor emulator LEDs

pmt drive arduino10
PMT/Drive Arduino

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

pmt drive arduino11
PMT/Drive Arduino

Connectors for PMT lead and Arduino USB connector

slide21
End

Questions?

spiral search
Spiral Search

Spiral Search routine built