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Equipment/Vending machine: Difference between revisions
From London Hackspace Wiki
→Motor Controller
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common OE | common OE | ||
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. | |||
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... | ||
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I've marked the underside of the board which pins on the MCU do what. | I've marked the underside of the board which pins on the MCU do what. | ||
Power to the vending board is 25volts AC, the green wire from the PSU goes to chassis. | |||
Power to the vending board is 25volts AC, the green wire | |||
Artag's Thyristors board works, the controller pins draw 4-5ma at 5V. | Artag's Thyristors board works, the controller pins draw 4-5ma at 5V. | ||
