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Nixie Display Interfacing to MINI-MAX/51-C2
The MINI-MAX/51-C2 can drive Nixie tubes via 74141 Nixie BCD Decoder Driver TTL IC's. MINI-MAX/51-C2 has 32 I/O port pins:
| Port Pins | Description |
|---|---|
| P3.0, P3.1 | Reserved for RS232 Serial Port |
| P1.5 | Reserved for slave processor |
| P1.6,P1.7 | Reserved for I2C Bus |
| P3.2, P3.3, P3.4, P3.5, P3.6, P3.7 | 6 port pins for Nixie interfacing |
| P2 | 8 port pins for Nixie interfacing |
| P0 | 8 port pins for Nixie interfacing |
| P1.0, P1.1, P1.2, P1.3 | 4 port pins for Nixie interfacing |
Each 74141 BCD Decoder/Driver uses 4 port pins.
Therefore, each MINI-MAX/51-C2 can support up to 6 digit displays for clocks that need to display time in an Hours:Minutes:Seconds format. In addition to displaying time, the MINI-MAX/51-C2 can display virtually any value on the Nixie tube using available option boards. For example, the MINI-MAX/51-C2 can display analog voltages on the Nixies using its on board 5 channel analog inputs.
The MINI-MAX/51-C2, through its PC based interface, allows the user to create BASIC or C programs that allow maximum flexibility in presenting information on the Nixie tubes. This eliminates the need for hardwiring the displays for a dedicated function. To switch from a clock to a temperature display is as easy a writing a new short program on the PC and downloading it to the controller. No wiring changes necessary. In addition, with the available Real Time Clock you never need to reset the Nixie time display as the battery backup keeps current and accurate time. So if a power failure occurs or if you just wish to turn the Nixies off - no clock setting every time you turn your Nixies on. Just turn the power back on and the correct time and date are displayed.