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APT 2.0
Simon Dawes & Keith RickardUpdate 2
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Mission ControlMonitor
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)
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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
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Hand Box
2x16 character LCDBuzzerKeypad (backlit)Red Light Torch
Windows can talk to HandboxLinux work in progress (few bugs to iron out)
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Software
~30% complete; 1700 lines of codeTest / Proof of Concept Software• WHORU test • Handbox test• Cross platform WHORU test
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Demo!
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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.
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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
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PMT/Drive Arduino
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PMT/Drive ArduinoPMT pulse emulator buttons
Counter chips
Stepper motor test jumper
PMT pulse connector
Stepper motor emulator LEDs
Stepper connector
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PMT/Drive Arduino
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PMT/Drive Arduino
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PMT/Drive Arduino
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PMT/Drive Arduino
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PMT/Drive Arduino
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PMT/Drive Arduino
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PMT/Drive Arduino74LS05 hex inverter chip between Arduino and Stepper Motor Control Boards
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PMT/Drive Arduino
Connectors for PMT lead and Arduino USB connector
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PMT/Drive Arduino
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PMT/Drive Arduino
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End
Questions?
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Spiral Search
Spiral Search routine built