It can be connected up to 16 cards issued to the I2C bus. The following addresses are adjustable by jumpers: PCF8574: 64, 66, 68, 70, 72, 74, 76, 78 PCF8574A: 112, 114, 116, 118, 120, 122, 126, 128
So you can control up to 128 outputs on these cards.
The board can be equipped with power transistors or with single-line relay either. or mixed 2 transistors and 6 relay or, as in Figure 4 transistors and 4 relay or ........
Dimensions of the circuit board 75x 80 mm
The board can be equipped with power transistors or with Single Line Relay either. or mixed transistors 2 and 6 relays or as in picture 4 transistors and 4 relay or ........
The port extensions PCF8574 or PCF8574 A have the disadvantage that they switch at power ON all outputs HIGH. Only when transmitting data over the bus are transferred, the outputs switch correctly.
Inverted logic: If this interferes with your application, the board can also be fitted with negative logic. The outputs or relays remain in power ON initially off. About the bus but the value must be transferred inverted. Should, for example, will be the first output high must be 254 sent to the bus. The controller simply drag the value to be output by 255 from before transferring him.
The power transistor switches in this case mass. The consumer is thus connected to the positive supply voltage (max. 40V).
Who do not like switching the "Minus" the board should be equipped with relay! Then you can turn what you want plus, minus, AC
Normal logic: In this case, the outputs are "normal" addressed in BCD code. The outputs switch then corresponding to the transmitted bit pattern.
The power transistor switches in this case the positive supply voltage The consumer is thus connected to ground.
For more information and program examples, refer to the product page I2C-Ausgabekarte
I2C output board with transistor amplifiers 8- bit digital
All components required for the I2C output board including 8 power transistors BD135 (invers) or BD136 (normal) Switching capacity max. 45V 1.5A
I2C digital output board without amplifiers
If you want to have mixed the output stages ( eg 2 Ralais and 6 transistors)You can order the basic components here and the output stages separately below in the shop