using an R311 (maybe R303 maybe R300) capacitive fingerprint reader from an arduino, in this case a Leonardo
may also work with one of these other readers:
this one is a third the price and has higher resolution: https://www.aliexpress.com/item/R303-Capacitive-Fingerprint-Reader-Module-Sensor-Scanner/32620290283.html
this one has the same resolution: https://www.aliexpress.com/item/R300-All-in-one-Capacitive-Fingerprint-Reader-Module-sensor-FPC1020/32677023085.html
native USB port reporting for communications
GenImg() ///E3D0D6B53D36342C205765743D33322C204472793D3332200AEF01FFFFFFFF07000300000AGI:OK returned 0x0 Length:3 PID:0x7 Data:00 reported sum:10 actual sum:10 Img2Tz(1 or 2) //////EF01FFFFFFFF07000300000A returned 0x0 Length:3 PID:0x7 Data:00 reported sum:10 actual sum:10 Search(1,1,256) /EF01FFFFFFFF07000709000000000017 returned 0x9 Length:7 PID:0x7 Data:0900000000 reported sum:23 actual sum:23 PageID 0 MatchScore 0 GenImg() ///E3D0D6B53D38342C205765743D33322C204472793D3332200AEF01FFFFFFFF07000300000AGI:OK returned 0x0 Length:3 PID:0x7 Data:00 reported sum:10 actual sum:10 Img2Tz(1 or 2) //////EF01FFFFFFFF07000300000A returned 0x0 Length:3 PID:0x7 Data:00 reported sum:10 actual sum:10 Search(1,1,256) /EF01FFFFFFFF07000709000000000017 returned 0x9 Length:7 PID:0x7 Data:0900000000 reported sum:23 actual sum:23 PageID 0 MatchScore 0 TemplateNum() /EF01FFFFFFFF070005000002000E returned 0x2 Length:5 PID:0x7 Data:000002 reported sum:14 actual sum:14
1 GenImg() ///E3D0D6B53D39382C205765743D33322C204472793D3332200AEF01FFFFFFFF07000300000AGI:OK returned 0x0 Length:3 PID:0x7 Data:00 reported sum:10 actual sum:10 Img2Tz(1 or 2) ///////EF01FFFFFFFF07000300000A returned 0x0 Length:3 PID:0x7 Data:00 reported sum:10 actual sum:10
2 GenImg() ///E3D0D6B53D39312C205765743D33322C204472793D3332200AEF01FFFFFFFF07000300000AGI:OK returned 0x0 Length:3 PID:0x7 Data:00 reported sum:10 actual sum:10 Img2Tz(1 or 2) ///////EF01FFFFFFFF07000300000A returned 0x0 Length:3 PID:0x7 Data:00 reported sum:10 actual sum:10 RegModel() /EF01FFFFFFFF07000300000A returned 0x0 Length:3 PID:0x7 Data:00 reported sum:10 actual sum:10 Store(1,TemplateNum()+1) //EF01FFFFFFFF07000300000A returned 0x0 Length:3 PID:0x7 Data:00 reported sum:10 actual sum:10 TemplateNum() /EF01FFFFFFFF070005000002000E returned 0x2 Length:5 PID:0x7 Data:000002 reported sum:14 actual sum:14
3 GenImg() ///E3D0D6B53D39312C205765743D33322C204472793D3332200AEF01FFFFFFFF07000300000AGI:OK returned 0x0 Length:3 PID:0x7 Data:00 reported sum:10 actual sum:10 Img2Tz(1) ///////EF01FFFFFFFF07000300000A returned 0x0 Length:3 PID:0x7 Data:00 reported sum:10 actual sum:10 Search(1,1,256) /EF01FFFFFFFF070007000011006F008E returned 0x0 Length:7 PID:0x7 Data:000011006F reported sum:142 actual sum:142 PageID 17 MatchScore 111
e Empty()