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You just found the perfect I2C sensor, and you want to wire up two, three, or more of them to your Arduino. When you realize Oh no, this chip has a fixed I2C address, and from what I know about I2C; you cannot have two devices with the same address on the same SDA/SCL pins. Are you out of luck? You would be if you don’t have this cool CJMCU TCA9548A I2C 8 Channel Multiple extensions development board.
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You just found the perfect I2C sensor, and you want to wire up two, three, or more of them to your Arduino. When you realize Oh no, this chip has a fixed I2C address, and from what I know about I2C; you cannot have two devices with the same address on the same SDA/SCL pins. Are you out of luck? You would be if you don’t have this cool CJMCU TCA9548A I2C 8 Channel Multiple extensions development board.
The CJMCU TCA9548A I2C 8 Channel Multiple extensions development board is interesting in that it has an I2C address (0x70 by default) and you basically send it a command to tell it which I2C multiplexed output you want to talk to, then you can address the board you want to address.
Program :
We suggest using this little helper to help you select the port
#define TCAADDR 0x70
void tcaselect(uint8_t i) {
if (i > 7) return;
Wire.beginTransmission(TCAADDR);
Wire.write(1 << i);
Wire.endTransmission();
}
You can then call tcaselect(0) thru tcaselect(7) to set up the multiplexer.
Note that you if you happen to have I2C devices with I2C address 0x70, you will need to short one of the Addr pins on the TCA9548 breakout to Vin in order to make it not conflict. Given that you can have 0x70 thru 0x77, just find one thats free and youre good to go.
1 x CJMCU TCA9548A I2C 8 Channel Multiple extensions development board.
2 x Header set ( Without Soldered).
Input Voltage (Volt) | 1.65 5.5 |
Clock Frequency (kHz) | 0 400 |
Dimensions (mm) | 22 x 32 x 2.7 |
Weight (gm) | 4 |
* Product Images are shown for illustrative purposes only and may differ from actual product.
Operating voltage | 2.5 3.0V |
Pixel Resolution | 0.3MP |
Photosensitive array | 640 x 480 |
Optical Size | 1.6 inch |
Angel of view | 67 degrees |
Maximum Frame Rate | 30fps VGA |
Sensitivity | 1.3V/(Lux-sec) |
Dormancy | Less than 20A |
Power consumption | 60mW/15fpsVGA YUV |
Temperature operation Range | -30 C ~ 70 C |
Pixel area | 3.6 x 3.6 m |
Signal to noise ratio (SNR) | 46 dB |
Dynamic range | 52 dB |
Input Voltage (Volt) |
1.65 5.5 |
---|---|
Clock Frequency (kHz) |
0 400 |
Dimensions (mm) |
22 x 32 x 2.7 |
Weight (gm) |
4 |
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