_Sanyo_BB-94HB.md

Documentation for BB-94HB 7 Segement 4 Digit display by Sanyo

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Overview

This display has two "cycles", which are just two layers with cathodes (minus pins). These are meant to be hooked up to the transformer, using the mains frequency (50/60Hz) to switch between them. In my clock, it was used with the LM8560 chip.

C/C++

Below (scroll way down past the grid) are two c/c++ programms for the arduino. These are intended to be used with 2 shift registers, daisy chained together, with their last output on pin 6. Note: NC pins are skipped. One is just a list with segments you can stack onto each other. The first value of each line is layer 1 and the other layer 2. The other programm is a complete example.

Pinout

I numbered these pins from left to right. Pin 30 is the one next to the "M". The letters are the the 7 segments of a digit (see below). NC = Not Connected

⚠️WARNING⚠️ Pins 26 and 29 are also connected to the layer common pins. If you sweep across with a wire this will cause a short!

Pin No.	Layer 1	Layer 2
1	Layer 1	Layer 1
2	Layer 2	Layer 2
3	NC	NC
4	NC	NC
5	Dot at the top-left	NC
6	NC	Digit 1 b
7	Digit 1 a	Digit 1 g
8	Digit 1 d	Digit 1 e
9	Digit 2 e	Digit 1 c
10	Digit 2 g	Digit 2 b
11	NC	NC
12	Digit 2 d	Digit 2 c
13	Digit 2 f	Digit 2 a
14	NC	NC
15	Digit 3 a	Digit 3 f
16	Digit 3 b	Digit 3 g
17	Digit 3 c	Digit 3 d
18	Digit 4 e	Digit 3 e
19	Digit 4 g	Digit 4 b
20	Digit 4 d	Digit 4 c
21	Digit 4 f	Digit 4 a
22	NC	NC
23	NC	NC
24	NC	NC
25	NC	NC
26	⚠️WARNING⚠️	Also connected to Layer 1
27	NC	NC
28	NC	NC
29	⚠️WARNING⚠️	Also connected to Layer 2
30	Double points in the middle	NC

bb-94hb-example.c

#define dataPin 2
#define clockPin 3
#define latchPin 4
#define layer1 5
#define layer2 7

int nextLayer = 1;
char currentDisplay[4] = "0000";
word result = 0;

const word digits[] = {
  // digit 1
  0b0000000000000000, 0b0000000000000000, // 0 left blank
  0b0000000000000000, 0b1001000000000000, // 1
  0b0110000000000000, 0b1110000000000000, // 2
  0b0000000000000000, 0b0000000000000000, // 3 not needed
  0b0000000000000000, 0b0000000000000000, // 4 not needed
  0b0000000000000000, 0b0000000000000000, // 5 not needed
  0b0000000000000000, 0b0000000000000000, // 6 not needed
  0b0000000000000000, 0b0000000000000000, // 7 not needed
  0b0000000000000000, 0b0000000000000000, // 8 not needed
  0b0000000000000000, 0b0000000000000000, // 9 not needed
  // digit 2
  0b0001011000000000, 0b0000111000000000, // 0
  0b0000000000000000, 0b0000110000000000, // 1
  0b0001110000000000, 0b0000101000000000, // 2
  0b0000110000000000, 0b0000111000000000, // 3
  0b0000101000000000, 0b0000110000000000, // 4
  0b0000111000000000, 0b0000011000000000, // 5
  0b0001111000000000, 0b0000011000000000, // 6
  0b0000000000000000, 0b0000111000000000, // 7
  0b0001111000000000, 0b0000111000000000, // 8
  0b0000111000000000, 0b0000111000000000, // 9
  // digit 3
  0b0000000000000000, 0b0000000000000000, // 0 left blank
  0b0000000011000000, 0b0000000000000000, // 1
  0b0000000110000000, 0b0000000011100000, // 2
  0b0000000111000000, 0b0000000011000000, // 3
  0b0000000011000000, 0b0000000110000000, // 4
  0b0000000101000000, 0b0000000111000000, // 5
  0b0000000000000000, 0b0000000000000000, // 6 not needed
  0b0000000000000000, 0b0000000000000000, // 7 not needed
  0b0000000000000000, 0b0000000000000000, // 8 not needed
  0b0000000000000000, 0b0000000000000000, // 9 not needed
  // digit 4
  0b0000000000101100, 0b0000000000011100, // 0
  0b0000000000000000, 0b0000000000011000, // 1
  0b0000000000111000, 0b0000000000010100, // 2
  0b0000000000011000, 0b0000000000011100, // 3
  0b0000000000010100, 0b0000000000011000, // 4
  0b0000000000011100, 0b0000000000001100, // 5
  0b0000000000111100, 0b0000000000001100, // 6
  0b0000000000000000, 0b0000000000011100, // 7
  0b0000000000111100, 0b0000000000011100, // 8
  0b0000000000011100, 0b0000000000011100 // 9
};


void getDigits() {
  result = 0;
  for (int digit = 0; digit < 4; digit++) {
    result = result | digits[digit * 20 + (currentDisplay[digit] - 48) * 2 + (nextLayer - 1)];
  }
}

void displayDigits() {
  if (nextLayer == 2) {
    getDigits();
    digitalWrite(layer1, HIGH);
    digitalWrite(latchPin, LOW);
    shiftOut(dataPin, clockPin, MSBFIRST, (result >> 8) & 0xFF);
    shiftOut(dataPin, clockPin, MSBFIRST, (result >> 0) & 0xFF);
    digitalWrite(latchPin, HIGH);
    digitalWrite(layer2, LOW);
    nextLayer = 1;
  } else {
    getDigits();
    digitalWrite(layer2, HIGH);
    digitalWrite(latchPin, LOW);
    shiftOut(dataPin, clockPin, MSBFIRST, (result >> 8) & 0xFF);
    shiftOut(dataPin, clockPin, MSBFIRST, (result >> 0) & 0xFF);
    digitalWrite(latchPin, HIGH);
    digitalWrite(layer1, LOW);
    nextLayer = 2;
  }
}

void setup() {
  pinMode(dataPin, OUTPUT);
  pinMode(clockPin, OUTPUT);
  pinMode(latchPin, OUTPUT);
  pinMode(layer1, OUTPUT);
  pinMode(layer2, OUTPUT);

  delay(100);
}

void loop(){
  displayDigits();
  delay(10);
}

bb-94hb-list.c

const word digits[] = {
  // digit 1
  0b0000000000000000, 0b0000000000000000, // 0 left blank
  0b0000000000000000, 0b1001000000000000, // 1
  0b0110000000000000, 0b1110000000000000, // 2
  0b0000000000000000, 0b0000000000000000, // 3 not needed
  0b0000000000000000, 0b0000000000000000, // 4 not needed
  0b0000000000000000, 0b0000000000000000, // 5 not needed
  0b0000000000000000, 0b0000000000000000, // 6 not needed
  0b0000000000000000, 0b0000000000000000, // 7 not needed
  0b0000000000000000, 0b0000000000000000, // 8 not needed
  0b0000000000000000, 0b0000000000000000, // 9 not needed
  // digit 2
  0b0001011000000000, 0b0000111000000000, // 0
  0b0000000000000000, 0b0000110000000000, // 1
  0b0001110000000000, 0b0000101000000000, // 2
  0b0000110000000000, 0b0000111000000000, // 3
  0b0000101000000000, 0b0000110000000000, // 4
  0b0000111000000000, 0b0000011000000000, // 5
  0b0001111000000000, 0b0000011000000000, // 6
  0b0000000000000000, 0b0000111000000000, // 7
  0b0001111000000000, 0b0000111000000000, // 8
  0b0000111000000000, 0b0000111000000000, // 9
  // digit 3
  0b0000000000000000, 0b0000000000000000, // 0 left blank
  0b0000000011000000, 0b0000000000000000, // 1
  0b0000000110000000, 0b0000000011100000, // 2
  0b0000000111000000, 0b0000000011000000, // 3
  0b0000000011000000, 0b0000000110000000, // 4
  0b0000000101000000, 0b0000000111000000, // 5
  0b0000000000000000, 0b0000000000000000, // 6 not needed
  0b0000000000000000, 0b0000000000000000, // 7 not needed
  0b0000000000000000, 0b0000000000000000, // 8 not needed
  0b0000000000000000, 0b0000000000000000, // 9 not needed
  // digit 4
  0b0000000000101100, 0b0000000000011100, // 0
  0b0000000000000000, 0b0000000000011000, // 1
  0b0000000000111000, 0b0000000000010100, // 2
  0b0000000000011000, 0b0000000000011100, // 3
  0b0000000000010100, 0b0000000000011000, // 4
  0b0000000000011100, 0b0000000000001100, // 5
  0b0000000000111100, 0b0000000000001100, // 6
  0b0000000000000000, 0b0000000000011100, // 7
  0b0000000000111100, 0b0000000000011100, // 8
  0b0000000000011100, 0b0000000000011100 // 9
};