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By using simple i2c and SPI input/output expanders we have reduced the number of pins (only 2 pins are needed for i2c) while still making it easy to interface with the LCD
40mm diameter
For example The L297
can typically be found in ICs that specialize in reading the temperatures detected by the thermocouple probe
and making a temperature gradient between one end and the other (a 'hot' end and a 'cold' one)
74HC04D (Hex Inverter) xt60 By using simple i2c and74HC04D Hex Inverter has 6 element NOT gate logic IC. Specification Logic Type: NOT Propagation Delay Time: 85 ns, 17 ns, 14 ns No. of Gates: 6 Output Current: 5. 2mA No. of Inputs: 1 X 6 No. of Pins: 14 Operating Temperature Range: 40C to +125C Supply Voltage Range: 2V to 6V Package: DIP 14 For 74HC04 datasheet click Here