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sam.moshiri

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  1. Infrared remote controllers are everywhere around us. The majority of home appliances are controlled using infrared remote controls. In this article/video, we learn to build a device that can decode (almost) any IR remote control and use the instructions to switch the relays (loads). So we can use this feature in a variety of applications without buying a new IR remote control and expensive hardware, such as turning ON/OFF the lights, opening/closing the curtains, ... etc. I have used an ATTiny85 microcontroller as the heart of the circuit. The device can record up to three IR codes in the EEPROM memory and switch 3 separate devices. Each relay can handle the currents up to 10A. The load switching mechanism (momentary ON/OFF, toggling, .. etc) can be programmed by the user. I used Altium Designer 21.4.1 and the SamacSys component libraries (SamacSys Altium Plugin) to design the Schematic and PCB. I also used the Siglent SDS2102X Plus/SDS1104X-E to analyze the IR signals. The device works stable and reacts well to the transmitted IR signals. So let’s get started and build this puppy! References Article: https://www.pcbway.com/blog/technology/Infrared_Remote_Control_Decoder___Switcher_Board.html [1]: L7805 datasheet: https://www.st.com/resource/en/datasheet/l78.pdf [2]: TS2937CW-5.0 datasheet: http://www.taiwansemi.com/products/datasheet/TS2937_E15.pdf [3]: VS1838 infrared receiver module datasheet: https://www.elecrow.com/download/Infrared%20receiver%20vs1838b.pdf [4]: FDN360P datasheet: https://www.onsemi.com/pdf/datasheet/fdn360p-d.pdf [5]: ATTiny85-20SUR datasheet: http://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-2586-AVR-8-bit-Microcontroller-ATtiny25-ATtiny45-ATtiny85_Datasheet.pdf [6]: Si2302 datasheet: https://www.vishay.com/docs/63653/si2302dds.pdf [7]: Altium Designer electronic design CAD software: https://www.altium.com/altium-designer [8]: SamacSys Altium plugin: https://www.samacsys.com/altium-designer-library-instructions [9]: ATTiny85 schematic symbol, PCB footprint, 3D model: https://componentsearchengine.com/part-view/ATTINY85-20SUR/Microchip [10]: TS2937-5.0 schematic symbol, PCB footprint, 3D model: https://componentsearchengine.com/part-view/TS2937CW-5.0%20RP/Taiwan%20Semiconductor [11]: L7805 schematic symbol, PCB footprint, 3D model: https://componentsearchengine.com/part-view/L7805CV/STMicroelectronics [12]: SI2302 schematic symbol, PCB footprint, 3D model: https://componentsearchengine.com/part-view/SI2302DDS-T1-GE3/Vishay [13]: FDN360P schematic symbol, PCB footprint, 3D model: https://componentsearchengine.com/part-view/FDN360P/ON%20Semiconductor [14]: ATTinyCore: https://github.com/SpenceKonde/ATTinyCore [15]: IRRemote library: https://github.com/Arduino-IRremote/Arduino-IRremote [16]: Siglent SDS2102X Plus oscilloscope: https://siglentna.com/products/digital-oscilloscope/sds2000xp-series-digital-phosphor-oscilloscope [17]: Siglent SDS1104X-E oscilloscope: https://siglentna.com/digital-oscilloscopes/sds1000x-e-series-super-phosphor-oscilloscopes
  2. Does anybody know what's the problem with this earphone? so weird!
  3. In this video, I explain some theories behind a low pass active filter circuit, then I built a simple active low pass filter using the LM358 opamp. I tested the filter's behavior using the Siglent SDG1025 waveform generator and the Siglent SDS2102X Plus oscilloscope.
  4. Nowadays USB port is used widely for data transactions between electronic devices and computers. In many scenarios, there is no need to communicate with the USB port directly, therefore electronic designers use USB to UART (RS232-Serial) converter chips, so the USB port is converted to a virtual COM port on the computer. The initial thought of many designers is to use FTDI chips to do the USB to UART conversion. There is nothing wrong with FTDI chips, however, they are expensive. In this article/video, I introduced a cheap USB to UART converter module that uses the MCP2200 chip from Microchip. The converter supports both 3.3V and 5V serial logic levels and uses three LED indicators for power connection, data transmission, and data reception. The module supports the serial CTS and RTS pins, also six GPIOs that can be used for direct controlling of connected devices. The serial data of the module has been examined and decoded using the UART decoding feature of the Siglent SDS2102X Plus oscilloscope. So let’s get started! References Article:https://www.pcbway.com/blog/technology/Cheap_USB_to_UART_Converter_using_Microchip_MCP2200.html [1]: MCP2200 datasheet: https://www.mouser.se/datasheet/2/268/22228A-81933.pdf [2]: RT9166-33GX datashet: https://www.richtek.com/assets/product_file/RT9166=RT9166A/DS9166A-23.pdf [3]: MCP2200 schematic symbol, PCB footprint, and 3D model: https://componentsearchengine.com/part-view/MCP2200-I/SO/Microchip [4]: RT9166-33GX schematic symbol, PCB footprint, and 3D model:https://componentsearchengine.com/part-view/RT9166-33GX/RICHTEK [5]: Electronic designing CAD software plugins: https://www.samacsys.com/library-loader-help [6]: Altium Designer plugin: https://www.samacsys.com/altium-designer-library-instructions [7]: Microchip MCP2200 configuration utility: https://ww1.microchip.com/downloads/en/DeviceDoc/MCP2200 Configuration Utility v1.3.1.zip [8]: Siglent SDS2102X Plus oscilloscope: https://www.siglenteu.com/digital-oscilloscopes/sds2000xp
  5. In this video, I have reviewed the DS-VC288 panel mount voltmeter/Ammeter using the Siglent SDM3045X benchtop multimeter. The VC288 meter did not present acceptable readings, especially in the current measurement. It uses an LM358 Opamp which is not suitable for this purpose and it does not show a linear behavior. The SDM3045X multimeter was used as a reference. I have tested the voltage and current readings separately.
  6. A tip: As I mentioned in the video, in the last revision of the PCB board (which is available for you), the distance between electrolytic capacitors and the power resistors has been increased, however, if you still have concerns about this, you can use 470uF-50V capacitors instead of 1000uf-50V capacitors which are smaller in diameter.
  7. Power supplies are one of the most popular topics in electronics. There are two major types of regulated power supply: linear and switching. Both power supply types introduce some advantages and disadvantages, however, a linear power supply offers better line and load regulation figures and it handles lower noise at the output, specifically when the power supply is adjustable and the output is under load; although its efficiency is lower than a switching power supply. In this article/video, I introduced an adjustable 30V-4A linear power supply that provides constant voltage and constant current adjustment. The output noise of the power supply is low and has measured using the power analysis feature of the Siglent SDS2102X Plus oscilloscope. All component packages are through-hole, so you don't need any special tool for soldering. Let's get started! Specifications Input Voltage (max): 35V [30V, max-tested] Output Voltage (min): 1.28V Output Voltage (max-tested): 27.35V [28.9Vin, no load, 25C] Output Current: 1.1mA to 4A(max continous) Output Noise (no load): 6-7mVpp Output Noise (1A load): 6-7mVpp Output Noise (2A load): 8-10mVpp References Article: https://www.pcbway.com/blog/technology/30V_4A_Adjustable_Power_Supply__CC_CV_.html [1]: LM338 datasheet: https://www.mouser.com/datasheet/2/405/lm338-440432.pdf [2]: IRLZ44 datasheet: https://www.vishay.com/docs/91328/sihlz44.pdf [3]: LM358 datasheet: https://www.mouser.com/datasheet/2/308/lm358-d-299970.pdf [4]: 78L09 datasheet: https://www.jameco.com/Jameco/Products/ProdDS/192225.pdf [5]: LM358 schematic symbol, PCB footprint, 3D model: https://componentsearchengine.com/part-view/LM358N%2FNOPB/Texas%20Instruments [6]: 78L09 schematic symbol, PCB footprint, 3D model: https://componentsearchengine.com/part-view/MC78L09ACPG/ON%20Semiconductor [7]: LM338 schematic symbol, PCB footprint, 3D model: https://componentsearchengine.com/part-view/LM338T%2FNOPB/Texas%20Instruments [8]: IRLZ44 schematic symbol, PCB footprint, 3D model: https://componentsearchengine.com/part-view/IRLZ44NPBF/Infineon [9]: Electronic designing CAD software plugins: https://www.samacsys.com/library-loader-help [10]: Altium Designer plugin: https://www.samacsys.com/altium-designer-library-instructions [11]: Siglent SDS2102x Plus oscilloscope: https://www.siglenteu.com/digital-oscilloscopes/sds2000xp
  8. FM transmitters/receivers are among the top favorite circuits of any electronic enthusiast. In this article/video, I have introduced a complete digital FM receiver design that has equipped with an LCD screen and three push-buttons. It can search for the FM signals from 76MHz to 108MHz manually and automatically (Scan mode). The signal strength is also displayed as a bar graph on the LCD screen. The output sound is amplified by a 3W+3W Class-D stereo amplifier that handles high-quality and strong enough audio power. As a controller, I have used the cheap and popular Arduino-Nano board. So let’s get started! References Article: https://www.pcbway.com/blog/technology/A_Digital_FM_Receiver_with_Arduino.html [1]: TEA5767 Datasheet: https://www.sparkfun.com/datasheets/Wireless/General/TEA5767.pdf [2]: TEA5767 Schematic Symbol, PCB Footprint, and 3D Model: https://componentsearchengine.com/part-view/TEA5767HN%2FV3%2C118/Nexperia [3]: PAM8403 Datasheet: https://www.mouser.com/datasheet/2/115/PAM8403-247318.pdf [4]: PAM8403 Schematic Symbol, PCB Footprint, and 3D Model: https://componentsearchengine.com/part-view/PAM8403DR/LITTELFUSE [5]: TS2937 Datasheet: https://www.mouser.com/datasheet/2/395/TS2937_D13-522475.pdf [6]: TS2937 Schematic Symbol, PCB Footprint, and 3D Model: https://componentsearchengine.com/part-view/TS2937CW-5.0%20RP/Taiwan%20Semiconductor [7]: CAD Plugins: https://www.samacsys.com/library-loader-help
  9. In this video, I've talked about the XY mode/feature of a Siglent SDS1104X-E oscilloscope and used it in a combination with a Siglent SDG1025 waveform generator to show how you can build an interesting component tester (V-I curve tracer) to test silicone diodes, Zener Diodes, Schottky diodes, LEDs, Resistors, transistors, capacitors .. etc. Also, you can use it to learn about the behavior of the components and semiconductors. You only need to follow a very simple circuit (schematic) and hock the probes to the correct circuit points. In the video, I have tested these components: 330-ohm resistor, 1N4007 diode, 1N4148 diode, 1N5819 Schottky diode, a white LED and a green LED. the memory depth of the oscilloscope was set on 7M.
  10. An H-Bridge (Full-Bridge) driver is quite popular in driving loads such as brushed DC motors and it is widely used in robotics and industry. The main advantages of using an H-Bridge driver are: high efficiency, rotation direction change, and braking the motor. In this article/video, I have introduced a complete H-Bridge DC motor driver using four IR3205 power MOSFETs and two IR2104 MOSFET drivers. Theoretically, the above-mentioned MOSFET can handle currents up to 80A, however, in practice we can expect to get currents up to 40A if the MOSFET temperature is kept as low as possible, using a big heatsink or even a fan. References Article: https://www.pcbway.com/blog/technology/Powerful_H_Bridge_DC_Motor_Driver.html [1]: IRF3205 Datasheet: http://www.irf.com/product-info/datasheets/data/irf3205.pdf [2]: IR2104 Datasheet: https://www.infineon.com/dgdl/Infineon-IR2104-DS-v01_00-EN.pdf?fileId=5546d462533600a4015355c7c1c31671 [3]: 1N5819 Datasheet: https://www.diodes.com/assets/Datasheets/ds23001.pdf [4]: IR2104 Schematic Symbol, PCB Footprint, 3D Model: https://componentsearchengine.com/part-view/IR2104PBF/Infineon [5]: IRF3205 Schematic Symbol, PCB Footprint, 3D Model: https://componentsearchengine.com/part-view/IRF3205ZPBF/Infineon [6]: CAD Plugins: https://www.samacsys.com/library-loader-help
  11. Features High stability and no sensitivity to the ambient light Laser-cut acrylic (plexiglass) enclosure Cost-effective Flow control capability of the hand-sanitizer/alcohol (efficiency) Through-hole components (easy to solder) Single-layer PCB board (easy to fabricate) Single and cheap ATTiny13 microcontroller Low standby current consumption As we all know, the COVID-19 outbreak hit the world and changed our lifestyle. In this condition, alcohol and hand sanitizers are vital, expensive, and in some areas hard to find fluids, so, they must be used properly and efficiently. In the second version of the hand sanitizer dispenser device, I have addressed the previous design problems and introduced a device with no sensitivity to the ambient light and flow control capability of the alcohol/sanitizer. Therefore just enough amount of liquid will be poured on each request. The design uses a cheap ATTiny13 microcontroller. References Source: https://www.pcbway.com/blog/technology/Automatic_Hand_Sanitizer_Dispenser__Version_2___Using_ATTiny13.html [1]: TSOP1738 datasheet: https://www.batronix.com/pdf/tsop17xx.pdf [2]: 2N7000 datasheet: https://www.onsemi.com/pub/Collateral/NDS7002A-D.PDF [3]: ATTiny13 datasheet: https://componentsearchengine.com/Datasheets/1/ATtiny13-20PU.pdf [4]: BD139 datasheet: https://www.st.com/resource/en/datasheet/bd140.pdf [5]: 2N7000 schematic symbol and PCB footprint: https://componentsearchengine.com/part/1011182/model/download [6]: BD139 schematic symbol and PCB footprint: https://componentsearchengine.com/part/1041398/model/download [7]: ATTiny13 schematic symbol and PCB footprint: https://componentsearchengine.com/part/235118299/model/download [8]: CAD Plugins: https://www.samacsys.com/library-loader-help
  12. References Article: https://www.pcbway.com/blog/technology/4000W_Standalone_Digital_AC_Dimmer_Using_STM32.html [1]: TLP521 Datasheet: https://www.futurlec.com/Datasheet/LED/TLP521.pdf [2]: BTA26 Datasheet: https://www.mouser.com/datasheet/2/389/cd00002264-1795706.pdf [3]: AN437, ST Application Note: https://www.st.com/resource/en/application_note/cd00004096-rc-snubber-circuit-design-for-triacs-stmicroelectronics.pdf [4]: MOC3021 Datasheet: http://www.farnell.com/datasheets/97984.pdf [5]: AMS1117-3.3 Datasheet: http://www.advanced-monolithic.com/pdf/ds1117.pdf [6]: STM32F030F4 Datasheet: https://www.mouser.com/datasheet/2/389/dm00088500-1797910.pdf [7]: Schematic Symbol and PCB Footprint of TLP521: https://componentsearchengine.com/part/1774908/model/download [8]: Schematic Symbol and PCB Footprint of MOC3021: https://componentsearchengine.com/part/229006098/model/download [9]: Schematic Symbol and PCB Footprint of BTA26-600: https://componentsearchengine.com/part/1587919/model/download [10]: Schematic Symbol and PCB Footprint of AMS1117-3.3: https://componentsearchengine.com/part/656857/model/download [11]: Schematic Symbol and PCB Footprint of STM32F030F4: https://componentsearchengine.com/part/182014793/model/download [12]: Electronic CAD Plugins: https://www.samacsys.com/library-loader-help [13]: 2N7002 Datasheet: https://www.diodes.com/assets/Datasheets/ds11303.pdf [14]: Schematic Symbol and PCB Footprint of 2N7002: https://componentsearchengine.com/part/228320879/model/download
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