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Pocket Calculator Control Interface

Communicating with a TI-83(Plus) or TI-84 Plus

Pocket Calculator Control Interface
Pocket Calculator Control Interface
Programmable calculators used to be exotic, but now they are standard equipment in almost every school or polytechnic. The TI-83 (Plus) and TI-84 Plus are especially popular. Both models have a ‘link port’ for exchanging data. If you connect the right hardware to this port, you can do much more with it.
Every technician or engineer has a pocket calculator somewhere on their desk. Although the internal processes of these calculators are hardly suitable for control tasks, some of them can be used to build a nice robot.
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Materials

Gerber file

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PCB

Extra info / Update

Technical specifications
• 32 ESD-protected inputs/outputs including connectivity for I2C, AVR-ISP, JTAG, RS485 and general I/O.
• Supply regulation using 7805
• Firmware all in C
• Simple to program

Component list

Resistors
R1-R5 = 4k?7 (SMD 0805)
R6,R15 = 47? (SMD 0805)
R7-R14 = 1k? (SMD 0805)
Capacitors
C1-C5 = 100nF (SMD 0805)
C6,C9 = 18pF (SMD 0805)
C7,C8 = 10?F 50V
Semiconductors
D1 = SM4007
D2,D4 = 8.2V zener diode
D3,D5 = 4.7V zener diode
IC1 = not fitted
IC2 = ATmega32-P, programmed
IC3 = 7805DT
IC4 = MAX487CSA
PB1-PB8 = LED (SMD 0805)
Miscellaneous
L1 = 10?H
Q1 = 8MHz
PORTB,PORTD,JTAG,ADC = 10-way boxheader
ISP,I2C = 6-way DIL pinheader
POWER,RS485 = PC terminal block, lead pitch 5 mm (0.2”)

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