A digital Multimeter provides a strong basis for the development of a Basic Electronics principles and applications course.VIDEO: https://we.tl/t-FRPuvyCaMzThis is part of an 8-week course on the basics of electronics for beginners. The final laboratory is soldering and testing multimeter as well as coding and testing it. A basic working microPython program (110 lines of code) has been developed to handle all the basic calculations (ADC values) as well as displaying these values on a quad 7-segment display. The current version uses THT technology to help students get some experience soldering. SW1 - Switch1 is used to POWER on/off the multimeter when it is connected to a 9V battery.SW2 - Switch2 is used to switch between programming the Raspberry Pi from the USB or using BATTERY to power the device. Warning: set this switch to USB if programming the Raspberry Pi, otherwise set this switch to BAT when connecting your device to a 9V battery.SW3: When measuring Volts, set this to Volts, otherwise set this to the milliAMPS current settingSW4: When measuring Volts you can adjust the range to 1000mV (max) or 10V (max) measurements.SW5: To let the Raspberry Pi know you are measuring Volts or Current (Amps). The default setting is Volts due to an internal pull-up resistor.Safety:There is a replaceable 1000mA fuse is things get out of control.A 3.0V zener diode (D4) is used as a reference voltage on the ADC-ref input (after measuring it once installed it measured 2.74V)A shottky diode (D3) is used to prevent current returning to the Battery. This reduces the 5.5V supply down to 5.25V to the PicoA Diode (D1) is used for over current protection, buu was not used in this design.VIDEO:hopefully this works....but I have a video of this multimeter: https://we.tl/t-FRPuvyCaMzI uploaded it to WeTransfer. It is about 170MB !! (note:Anson help upload the video in youtube)microPython codeYou will need to rename the file to Main.py before the pico will run it upon boot-up.You can make minor changes to the conversion factor based on the accuracy of your components.The current Raspberry can work with or without the 3V zener diode as a reference for the ADC. The current partnumber provides a 2.74 reference for some reason. So you will need to adjust the conversion factor from 3.3V to 2.74V.Suggestions for improvement:Find a better 1 Ohm sense resistor then the current version. The current version uses 2 parallel 2-Ohm resistors to allow for more current, but compromises on accuracy. The probes are currently used for both VOLT and Current measurement which allows for an efficient design but has some drawbacks. Some of the current probes and connectors could be improved. the 9V battery connector to the board needs a better interface - and can come lose with heavy use. The probe cables currently use alligator clips but may be nice to have interchangeable probes.There is no auto-detect or dynamic scaling capability for better display ranges. This can be improved with some minor hardware and software changes. The next iteration will be with 1206 SMD components

Hello!We have prepared a small tutorial with Raspberry Pi + UltrasonicSensor + Servo Motor. I would try another Raspberry Pi application forbeginners; I looked among the pieces I had at my disposal, and found somethinginteresting; I searched the internet for information about the parts I have,how to control them individually, and now I will try to combine them to make anapplication for learning purposes.Components used in this project:- Raspberry Pi;- Ultrasonic Sensor HC SR-04;- Servo Motor SG90;- PCA9685 PWM Driver.The first step is to install a library, which will help us usethe PWM driver PCA9685 (Figure 1), useful to control a servomotor, an LED or adc motor. Information can be found at this link:https://learn.adafruit.com/adafruit-16-channel-servo-driver-with-raspberry-pi/using-the-adafruit-library.Figure 1We start by opening Terminal Window and writing the command:sudo pip3 installadafruit-circuitpython-servokitWe are waiting for the package installation to be completed.The control of the SG 90 servomotor (Figure 2) is easy, we onlyneed a few program lines written in Thonny IDE:fromadafruit_servokit import ServoKitkit = ServoKit(channels = 16)We import and initialize the ServoKit class.Then, to move the actuator to an angle we want, we add thecommand:kit.servo [0] .angle= 0Figure 2The HC SR-04 ultrasonic sensor (Figure 3) is affordable, easy touse at 5V.Figure 3The electronic scheme according to which the connections aremade is the following:Figure 4The servomotor is connected to channel 0 of PCA9685; a supplyvoltage of 5V is required for the servomotor and the ultrasonic sensor, and a3.3V for the logic circuit of the PCA9685; PCA9685 driver, SDA and SCL pinsconnect SDA and SCL pins on the Raspberry Pi (physical pins 3 and 5); for theultrasonic sensor, the Trig pin -> GPIO23 (physical pin 16) and Echo ->GPIO24 (physical pin 18).Practical realization of the project (Figure 5):Figure 5The distance is displayed in centimeters, with two decimals, theprogram is run in Thonny Python (Figure 6):Figure 6Thanks to the PCBWay team for this activity!We expect as much from you!Success!

Motivation and About the ProjectAs the name suggests, my project Grand Home Automation using Home Assistant is all about making life easier using home automation systems. Earlier days, when I was a Raspberry pi and Arduino beginner and knew about basic components and their capabilities. I thought of automating my room to be more efficient at work. The ready-made home automation products were very costly but I kept browsing until I found out about OpenHAB. It was a game changer for me as it was open-source. Without wasting time, I bought the components and set up my first automated light. It worked fine. I started studying OpenHAB and fount out that it was way too complicated for large scale deployment. I started looking for alternatives and found out just the thing I was looking for. Home Assistant or HASSIO. It was perfect and had all the features of OpenHAB and even more. It was also way simpler than OpenHAB and had an addon just for esp-based devices. That was when I designed my first node. Later on I found out that it was only limited to lan access and had and paid verson for cloud. Then I designed another node which would receive the data from my cloud channel process it, send it to another node which would then send it to Home Assistant.Working of the ProjectOk. So, my project works on Home Assistant server that is flashed into a Raspberry Pi 3B. There is a redymade app for Home Assistant that works on lan through which I send commands like turn the light on to the server. The server then reads the command and send a signal to the corresponding node which then turns on the light. It also has a cloud feature for which I made an app in MIT App Inventor that sends the signal to my thingspeak cloud channel which is then received by an Wemos D1 mini. Wemos processes that data and then transfers it to another Wemos through UART connection which then goes into the Home Assistant lan server and the server responds to that signal.Future ScopeIn future, I will add a Raspberry Pi zero w attached with a camera to the mesh and will record and save it to Google Drive. ImagesRaspberry Pi (LAN Server)Node - 1 Appliance Controller (Esp8266 NodeMCU, DHT-11 Sensor, 4-Channel Relay Module, 220v to 5v Convertor)Wemos D1 mini (Cloud Server)Cloud Server Analytics

Weather station based on BME680 and Raspberry Pi Pico.