Features :

1. Input reverse polarity protection
2. Built-in output short protection function
3. The built-in thermal shutdown function
4. Press the right key to let the display show the input or output voltage. when the right “OUT” led light, it shows output, the left “IN” led show input.
5. Power-off memory function, show that road after power voltage values measured for the last time
6. Press the touch button for 3 seconds to turn off the LED display, touch the button again to turn on the LED display
7. The band terminals, no iron can also be easy to use, and retention wire connection point

Features:

1. Module: Non-isolated step-down module (BUCK)
2. Rectification: Synchronous rectification
3. Built-in 160°C thermal shutdown
4. Output ripple: 30mV (no-load)

Features :

1. It’s efficient by up to 93%.
2. It can source a good amount of current.
3. It is an inexpensive converter module.
4. It’s simple to adjust to get your desired increase in voltage.
   

   Note:

   1. The input voltage should not exceed the maximum input voltage.
   2. Peak current output current is not more than 2A for input & output.
   3. Please be noted that the output voltage should be higher than the input voltage.

Voltage Adjustments:

The output voltage can be adjusted using the Potentiometer on the module. Turning the pot clockwise, will decrease the voltage, and counter clockwise, will increase the output voltage.

Connections:

1. Vin+ = Input Voltage
2. Vin- = Ground
3. Micro USB Connector = Input Voltage
4. Out+ = Output Voltage
5. Out- = Ground

Precautions to be taken while using Module:

1. The output voltage must be higher than input voltage.
2. The input voltage must not exceed maximum input voltage specified.
3. Peak Current Draw from output should not be more than 2A.

Features :

1. Output current: Iout=1.2A(average) / 3.2A (peak)
2. Standby control to save power
3. CW/CCW/short break/stop motor control modes
4. Built-in thermal shutdown circuit and a low voltage detecting circuit
5. All pins of the TB6612FNG broken out to 0.1″ spaced pins
6. Filtering capacitors on both supply lines

Specification and Features :

1. 1-to-8 Bidirectional Translating Switches.
2. Supports Hot Insertion.
3. Low Standby Current.
4. 1-to-8 Bidirectional Translating Switches.
5. Active-Low Reset Input.
6. Power Up With All Switch Channels Deselected.
7. I2C Bus and SMBus Compatible.
8. 5-V Tolerant Inputs.
9. Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II.

Pin Description :

Power Pins:

• Vin – this is the power pin. Since the sensor chip uses 3-5 VDC. To power, the board, give it the same power as the logic level of your microcontroller – e.g. for a 5V micro like Arduino, use 5V.
• GND – common ground for power and logic.

I2C Control-Side pins :

• SCL – this is the I2C clock pin for the chip itself, connect to your microcontrollers I2C clock line.
• SDA – this is the I2C data pin for the chip itself, connect to your microcontrollers I2C data line.
• RST – this is the reset pin, for resetting the multiplexer chip. Pulled high by default, connect to ground to reset
• A0 A1 A2 – these are the address selection pins for the multiplexer. By default, the multiplexer is at address 0x70 and these three pins are pulled low. Connect them to Vin to set the address to 0x71 – 0x77.
• A0 is the lowest-significant bit (if it is pulled high, it will increase the address by 1).
• A1 is the 2nd-lowest-significant bit (if it is pulled high, it will increase the address by 2).
• A2 is the 3rd-lowest-significant bit (if it is pulled high, it will increase the address by 4).

I2C Multiplexed-Side pins:

• SDx and SCx:  There are 8 sets of SDx and SCx pins, from SD0/SC0 to SD7/SC7. These are the multiplexed pins. Each one is a completely separate I2C bus set. So you have 8 I2C devices with identical addresses, as long as they are on one I2C bus each.
• These pins do not have any pullups installed, so if you are using a chip or breakout without I2C pull-ups be sure to add them! Nicely, you can have Vin be 3.3V and have these pins pulled up to 5V (that is, they are 5V compliant).

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 that’s free and you’re good to go.

Note : Product may vary in two variants TCA9548A &  PCA9548A

Features:

1. Ampere meter can only be connected to a 5v input end of the module.
2. It is better than the charging current is 37% of the battery capacity. If you charge the battery of 1000mAh, a current of 400mAh is enough.
3. The connection wire should not be too thick.
4.  Make sure the connect point is good.
5. If the input voltage is too high, like 5.2v, the current will be less than 1000mA, it is normal. It is protection function, auto-subtract the charging current to avoid burn damage to the chip.
6.  NO Reverse polarity.