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Equipment/Vending machine: Difference between revisions
From London Hackspace Wiki
→Motor Controller
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strobes on both 58 chips to 10k pullups. | strobes on both 58 chips to 10k pullups. | ||
The sink drivers (5842a and 2003) are grounded via a 1.5R resistor, near R69. Voltage across it is measured on the lm2903 comparator U13, which can give current sensing. | The sink drivers (5842a and 2003) are grounded via a 1.5R resistor, near R69. Voltage across it is measured on the lm2903 comparator U13, which can give current sensing. The reference voltage is 29mV, making a threshold of 20mA as specified. | ||
so clock out 16 bits fiddle the 2 darlington pins and then hit OE... | so clock out 16 bits fiddle the 2 darlington pins and then hit OE... | ||
