Here is an example of reading the inputs on a PCF8574 I/O expander:
This module requires an external power supply
ISO 15693 and ISO 18000-3 mode 1 compatible
FIT0278 / FIT0503
and features the industry standard 20- 4mA output where 20mA is minimum range and 4mA is maximum range
Tamiya 72005 6-Speed Gearbox Kit Shipping:2-4 Weeks Here is an example ofThis versatile, high efficiency gearbox lets you build one of the following gear ratios: 11. 6: 1, 29. 8: 1, 76. 5: 1, 196. 7: 1, 505. 9: 1, and 1300. 9: 1. Whatever your application, chances are that one of the configurations will do the job. The Tamiya 72005 6 speed gearbox is a versatile, high efficiency gearbox that you can build in one of the following gear ratios: 11. 6: 1, 29. 8: 1, 76. 5: 1, 196. 7: 1, 505. 9: 1, and 1300. 9: 1. Whatever your