Hello, could you take some time to confirm the following events? Thanks.
1. Open the device manager, then check whether there is a device name "silicon labs cp210x usb to uart bridge" in the ports(COM&LPT)
It looks like this:
 

2. If there is no such device, please install the CP2102N driver. 
Download the driver from this link: https://www.silabs.com/products/develop ... cp-drivers

3. If you install the driver, but there is still no such device. Please check whether the microUSB cable can transmit the USB signal. Some microUSB cables can only be used for charging and cannot transmit USB signals. You can use some other device to check whether the microUSB cable can transmit the USB signal, or directly use other microUSB cables.

Hello,

After reviewing the log you uploaded, I noticed that you calibrated the pH 7.0 point twice, and the measurement values of the pH 7.0 standard solution fluctuate significantly, which seems to be the issue.

When a pH sensor measures a neutral solution, the presence of fewer relevant ions can cause fluctuations in the measurements. If these fluctuations exceed the acceptable range, the Arduino code may consider the standard solution to have a significant error, leading to failure.

Therefore, when calibrating the sensor with a pH 7.0 standard solution, only one successful calibration is needed. You can then use another standard solution for further calibration.

The calibration of a pH sensor is a two-point calibration, using pH 7.0 and pH 4.0 standard solutions to calibrate the intercept and slope of the pH probe respectively. Therefore, please use these two standard solutions and perform a calibration once for each.

Additionally, please ensure that the pH sensor interface and the signal transmission board remain dry, as moisture may result in more neutral measurement values. You can use a hairdryer or similar device to heat and remove moisture.

Please strictly follow the steps in the tutorial to attempt recalibration: https://wiki.dfrobot.com/Gravity__Analog_pH_Sensor_Meter_Kit_V2_SKU_SEN0161-V2#target_3

Could you send some pictures or videos of this problem to techsupport@lattepanda.com?

It will provide you with further help.

It supports 4K 60Hz. You may use a video player like PotPlayer.

From the comments on the Kickstarter page, It seems that it is still in development.

You could download the certificate files from https://github.com/LattePandaTeam/LattePanda-Certification/tree/main/LattePanda%20V1.

The relation between voltage and pressure is shown in the picture:

https://dfimg.dfrobot.com/nobody/wiki/523137dc6f50feb019b55f25f80cb4df.png

The pressure and voltage are linear. The offset value is about 0.5V. So the slope is 1000(kpa)/4(V) = 250.

There are about 50 April tags that can be stored without the TF card.

The R2 and R5 are not the resistors, they are resettable fuses. When the input current is much larger than the designed value, they will be automatic to limit the current, with the TVS diode, they can protect the components from damage.

What is the model or SKU of your LattePanda board? In addition, could you provide detailed information or the model of your SD card?

PRO specific commands are commands like getting camera image or screen shot from huskylens or sending image for huskylens to learn, which will require USB and using python library to make it work. It will be released in the next version.

By using sample code, the sensor would be work in Arduino UNO. → So did you test the EMG sensor with Arduino UNO and work fine? 

The ADC of ATmega128 is also 10bit, the same as Arduino UNO, so it can detect the sensor signal.

BTW, could you share your codes on ATmega128?

The normal working voltage is 3.3~5V, but for stable operation, it is recommended that the power supply voltage should be in 3.6V~5V, and the power supply can output more than 300mA stably.

HuskyLens can be powered by a USB port and PH2.0 4pin port. If both ports are powered, the power supply of the USB port will be used first.

BTW, could you share the physical wiring images of your project?

Only when the transmitter board output 0V can it prints pH 15.45 on the serial monitor.

Please check whether the transmitter board gets the suitable supply voltage range, that is, 3.3~5V.

Then short circuit the BNC input pin, the pH value on the serial monitor should be about 7.0. If not, please contact techsupport@dfrobot.com for further help.

Does it work normally for a while after pressing the reset button on the arduino board? If yes, please check whether the connection is reliable and the power supply is stable.If not resolved, please contact techsupport@dfrobot for further help.

The first formula is to convert the voltage value to the corresponding TDS value.The second formula performs temperature compensation, because the temperature has an influence on the TDS value, and temperature compensation can try to eliminate this influence.Both formulas are correct and required.

You can find the DFRobot SVG library on this link: https://github.com/DFRobot/DFRobot-SVG

Maybe this display is suitable for you: https://www.dfrobot.com/product-2067.html

#define RES2 820.0

This is determined by hardware, one of the op-amp's feedback resistors is 820 ohms, so that's where the 820 number comes from.

Please see the schematic link below. R10 = 820 Ω

https://image.dfrobot.com/image/data/DFR0300/DFR0300_v1.0_schematic.pdf

#define ECREF 200.0

This is also determined by hardware. The amplitude of the high-frequency square wave signal emitted by the BNC port is 200mv. 

This sensor output the linear voltage signal, not the current singal.  The output voltage range is 0V to 4.5V.