• ##### Measure Any AC Voltage Up to 250Vabout 23 hours ago

Sorry I don't know about this, but first try to use the ADC alone with a test code to check if everything is working right then test it with the code, also don't forget about the library; the calucation there are for 10 bits ADC so try to adjust, and also for the sampling rate it's over there too...goodluck

• ##### Measure Any AC Voltage Up to 250V3 days ago

Hi, no problem, the slope and intercept are just some basic algebra (y=ax+b) where "a" is the slope and "b" is the intercept.
(let's suppose that the calculations are done)
for x=0V as input you should have y=0V
but you'll find that "y" is different from 0
so you set "b=-y" and you get (if x=0 then y=0)
and for other known values you'll have "x", "y" and "b" are known and you look for "a" (the slope) it's like a linear calibration.
So this is done after, and what's done before is a bit difficult, and you should look for "standard deviation" and "average square value" and don't forget in the library they are just called not explained as well if you want to know how it's done inside the library you'll find yourself in some very deep things... so it's better to look for the statistics things I told you and more important to calculate the RMS of a signal by hand and use the formula that works with every signal not just the sinewave ones and you'll understand the deal

• ##### Measure Heart Rate and SpO2 with MAX301024 days ago

Yes, you can.

• ##### Measure Any AC Voltage Up to 250V4 days ago

Hi, to understand better you can check the "RunningStatistics.cpp" file from the library, you'll find the mathematical functions, it takes the input which is an analog one, do some sampling then calculate the average square value and after the standard deviation...
For the intercept and slope you can make the input as 0 and you should have 0 then take a known value and calibrate the slope
For the "current_Volts= current_Volts*(40.3231)" actually I had this lying around for 2 years and first it was mean't to measure "Current" so multiplied by (40.3231).
About the multimeter, cheap multimeters measure all AC signals as sinewaves, if you want to use it to calibrate, measure AC sinewave signal from a socket or after a transformer, but since I used a Triac based light dimmer I had to use a TRMS multimeter to get the right value.

• ##### Measure Heart Rate and SpO2 with MAX301029 days ago

Hi, thanks I bought it for 3\$ from aliexpress, you can order it there or from SparkFun, there are some variations but the important is the MAX30102 chip, there's also MAX30105, I think it can work with this library and these codes.

• ##### Measure Heart Rate and SpO2 with MAX3010210 days ago

This can get you started: https://www.arduino.cc/en/Guide/HomePage
If you can't download the IDE, try the web editor, and the perfect example to start is "Blink", you'll need only Arduino board and usb cable.

• ##### Measure Heart Rate and SpO2 with MAX3010210 days ago

Hi if you want to improve this project, it's better to use a better board first, because the module's library takes a lot of memory space....

Thanks

• ##### Measure Heart Rate and SpO2 with MAX3010210 days ago

You're welcome, good luck

• ##### BMP280: Measure Temperature, Pressure and Altitude11 days ago

Hi, There are 4 codes above, two that work with the "Serial Monitor" and two work with the "OLED, screen"

• ##### DIY Heart Rate Sensor13 days ago

Even the 25\$ one? I tried a cheap 1\$ copy, it was awful

• ##### BMP280: Measure Temperature, Pressure and Altitude14 days ago

You're welcome.

Thanks

• ##### 7-Segment Clock with Arduino Nano + DS3231 + LDRabout 1 month ago

Thanks a lot, will try, because I uploaded some GIFs but didn't work. Cheers

• ##### New Year's Countdownabout 1 month ago

Silly question: How do you get Animated project image cover? Tried to upload GIF but won't work.

• ##### 7-Segment Clock with Arduino Nano + DS3231 + LDRabout 1 month ago

I was talking about the project cover image :D

• ##### 7-Segment Clock with Arduino Nano + DS3231 + LDRabout 1 month ago

Silly question: How do you manage to have an animated cover Image? I upload GIFs but they're not animated.

• ##### Control Dual Axis FPV Camera Cradle with Joystick Moduleabout 2 months ago

Bonjour, je m'excuse je n'ai jamais utilisé cette camera, vous pouvez utiliser une Mega ou le shield Arducam LF v2

• ##### Simple Alarm Clock with DS1302 RTCabout 2 months ago

Yes, but you'll need some work on the code, and don't forget to call day of the week function

• ##### Control Dual Axis FPV Camera Cradle with Joystick Moduleabout 2 months ago

You're welcome, if you need something I'm here, good luck

• ##### Control Dual Axis FPV Camera Cradle with Joystick Moduleabout 2 months ago

Hello, the joystick is like two potentiometers, you don't have to change anything.

• ##### Interfacing FPM10A (50-DY) Optical Fingerprint Sensor2 months ago

Hi, the module has a flash memory where the templates are stored. (Can save up to 164)

• ##### Simple Alarm Clock with DS1302 RTC2 months ago

Hello, if you can tell more about the compiling error, I can may be help, you probably have some libraries issues, did you install them correctly?

• ##### Interfacing and Fixing Touch Problem on TFT LCD 2.4″ Shield3 months ago

Hey thank you, I did a shoutout to you in the FPM10A fingerprint sensor project, check its tutorial video.

• ##### Simple Alarm Clock with DS1302 RTC3 months ago

You can contact me here if you want, www.facebook.com/SurtrTech/

• ##### Simple Alarm Clock with DS1302 RTC3 months ago

In the loop while you can do "while( code != 1)" and in that add some little instructions like to get a key and if the key is 3 it passes to the next instructions to get the key if it is 4 it continues like that and the last should set the code to 1 so you can get out of the while loop, this method is used in door locks but has a security fail, you can use it if you just make sure you're awake ...

• ##### Simple Alarm Clock with DS1302 RTC3 months ago

Yes it's possible, you can see in line 77 every button pressed can get you out of the loop, you have to change that, like your code is 3479
while (C1 != 3 && C2 != 4 and....) [
Ringing sequence
(and here you acquire the c1 c2 ...)
}

• ##### Simple Alarm Clock with DS1302 RTC3 months ago

It's an i2c adapter, I bought the LCD screen with the adapter board already fixed. And it's very useful, you can also try to reduce the keypad wires with onewire method.

• ##### Simple Alarm Clock with DS1302 RTC3 months ago

Hi, thanks for your encouragements, it's my first time, it needs improvements, I will mention your name and ProjectHub link in one of my videos.