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The basic principle of that
The basic principle of that
Into the static (only digital tube can realize) and dynamic
1: static better realize, in this much
2: digital tube dynamic
A hardware connection
Digital tube is generally 1/13 can scan, high brightness loss is bigger,
In this hypothesis is classified as 13, behavior of 16, Yang, each row of digital pipe together, each column of public section of digital together
Fathers, he can use tip127 switch directly driven by 154, linton 5 amp tube, 127 output don't add resistance
Do not suggest using 595 (164 2803 or 2003 + + in 2003, a 9013 output with current limiting resistor, generally for 56-330 ohms is < 1.0 (if the digital tube, can directly use 595 add resistance)
B, software
USES 89c51 CPU, memory can be used for the series, or 28c series 24c, they are not written speed quickly, but generally digital tube input device for the keyboard or remote speed, enough, and the reading speed and 24c series relatively slowly, I found out about the time data only 20 won't affect updated within
Display using clock interrupt 1, interrupted cannot exceed 1.5 ms, had better be in about ms, 1.2 interrupt service routine 24c02, can also read in the gaps in the reading, but must ensure that can read a list of all data! Read data on a display area, (in memory to define a array buf [16]), in the subroutine to send the letter in the data can be sent, had better use the most simple programming, serial port.
After sending off, and to control the letter did 154 RCLK (12 feet) a pulse, the data from the shift register to latches, transmission and open and input signal can be listed 154
3: the bitmap
A bitmap generally USES 1/16 scanning, control principle and digital tube
B: ok, hardware, with tip127 154 + add resistance with 595 (0 ~ 56 ohms) direct drive
C, software
