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Wismo228_gsm_modem_sch
- Wismo218/228 GSM modem schematic
SMS_remote_control
- For the master IC with 40 pins, it s 89C51 There are also com-port and 7805 as you can see the footprint Stuff of 4-pins button is for the hex keypad Resister pull-up and led can easily be recognized by their footprint I lost my schematic for