Category: Engineering

Why usb3.1 Type-C has two Dbus, RXbus and TXbus?

Post author By How To
Post date March 14, 2021
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So I am using a camera and making it connect to a hub. The hub only has 9 pins(single Dbus, RXbus and TXbus) while camera has usb3.1 which has double if all these buses (D,RX and TX). So to connect it to a hub can I just short these two buses. What should I do? […]

Tags RX and TX). So to connect it to a hub can I just short these two buses. What should I do? USB ports: Hub ports:, RXbus and TXbus) while camera has usb3.1 which has double if all these buses (D, So I am using a camera and making it connect to a hub. The hub only has 9 pins(single Dbus

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Can FPC 0.5mm cause usb 3.0 interference inside itself?

Post author By How To
Post date March 14, 2021
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I am designing an 4-port USB 3.0 hub and using fpc 0.5mm connector to connect it to other usb devices. Will using fpc 0.5mm cable have interference because of high data rate? I am talking about the interference inside the cable itself from D+,D- to SSRX or SSTX wire. I have been reading and only […]

Tags D- to SSRX or SSTX wire. I have been reading and only found out that it cause interference to wireless devices but nothing about interference, I am designing an 4-port USB 3.0 hub and using fpc 0.5mm connector to connect it to other usb devices. Will using fpc 0.5mm cable have interf

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74f269 counter getting very hot

Post author By How To
Post date March 14, 2021
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Hi I’m a DIY enthusiast and I got stuck with the circuit that I designed. The counter is getting very hot from the moment It’s powered up. In my setup the 330Ohm resistors at the outputs are connected to GND via a led for each resistor. (not the relays) I omitted the resistors at the […]

Tags and connected these directly to GND. Please tell me what I've done wrong. The components are soldered on a PCB that I had made by JLCPCB, Hi I'm a DIY enthusiast and I got stuck with the circuit that I designed. The counter is getting very hot from the moment It's powered up. I

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How can I get an integer from an RFID tag into a URL over serial communication?

Post author By Marcia D.
Post date March 14, 2021
No Comments on How can I get an integer from an RFID tag into a URL over serial communication?

I want to scan an RFID tage on an MFRC522 connected to an Arduino Mega, take that integer (of differing lengths for different tags) and pass it to an ESP8266 NodeMCU 12-E using serial communication, and have the ESP8266 create a URL (e.g., ‘http://socialtickr.com/kidskillz/sendstringtoESPa.php?tag=24498’) sent over wifi. The server should respond by creating and sending […]

Tags 'http://socialtickr.com/kidskillz/sendstringtoESPa.php?tag=24498') sent over wifi. The server should respond by creating and sending a string, ", "); // get the first part - the string strcpy(studentname, "); strcpy(answertextA, "); strcpy(answertextB, "); strcpy(answertextC, "); strcpy(answertextD, "); strcpy(correctanswertext, "); strcpy(learningpathid, "); strcpy(questionnumber, "); strcpy(questiontext, //http://socialtickr.com/kidskillz/sendstringtoESPa.php?tag=24498 void recvWithStartEndMarkers() { static boolean recvInProgress = f, 1, 4, a, A') which the NodeMCU then passes to the Arduino, A" as produced by sending e.g., adding a null value to the end of the character array, and can confirm that it works ESP->Mega (at least inconsistently), and have the ESP8266 create a URL (e.g., and I cannot figure out whether the problem is in a) sending the tag number from Mega to ESP / having the ESP receive the tag number; b)creat, answertextA); } if (PlayerResponseButton == "B") { Serial.println("Working from Answer Text B"); strcpy(PlayerResponse, answertextB); } if (PlayerResponseButton == "C") { Serial.println("Working from Answer Text C"); strcpy(PlayerResponse, answertextC); } if (PlayerResponseButton == "D") { Serial.println("Working from Answer Text D"); strcpy(PlayerResponse, answertextD); } //Serial.println ("Player response = " + String(String(PlayerResponse))); Serial.println("The correct answer is " + Strin, B, because the hardcoded works sometimes - but any other direction is greatly appreciated. I have tried converting the character array that shou, but can't produce it dynamically from different RFID tags]; c) memory issues; d) wifi issues; e) something else I have not thought of. I thi, c--, call next question from server } // end of void loop //////////////////////////////////////////////////////////////////////////////////////, d, D2);// assign pins to send data to and receive data from NodeMCU to Arduino Mega rx, e.g. the string //"Jack, etc. Nothing seems to work. Please note that I've stripped out the comments giving credit to others in a few places; I realize it's crazy lo, I want to scan an RFID tage on an MFRC522 connected to an Arduino Mega, I'm stumped on the Mega->ESP direction and am struggling to diagnose because I understand that I cannot have a serial monitor running on the, it will take 5 seconds before publishing the first reading."); delay(500); s.begin(9600); Serial.println("NodeMCU: Waiting for s, JACK, OUTPUT); Serial.println("Running Version Jan1a"); Serial.begin(115200); // Initialize serial communications with the PC Serial, password); Serial.println("NodeMCU: Connecting to Wifi"); while(WiFi.status() != WL_CONNECTED) { delay(500); Serial.print(".");, RST_PIN); // Create MFRC522 instance. String UID_string = ""; // to hold the integer sent from tag reader const byte numChars = 64; // Ar, starting with 'ans' and followed by the letter choice of the response while (receivedfromNextion == "") { while (Serial2.available()) { Ser, String &D); //String serverPath = String(serverName + receivedChars); // //int allot = sizeof(receivedChars); //receivedChars[(, strtokIndx); } ///////////////////////////////////////////////////////////////// void SendWithStartEndMarkers() { Serial.println("Mega:, strtokIndx); // copy it to studentname Serial.print("Student name: "); Serial.println(studentname); Serial2.print("pa, strtokIndx); // copy it to studentname strtokIndx = strtok(NULL, strtokIndx); Serial.print("Answer Text A: "); Serial.println(answertextA); Serial2.print("page1.b0.txt=\"" + String(, strtokIndx); Serial.print("Answer Text B: "); Serial.println(answertextB); Serial2.print("page1.b1.txt=\"" + Str, strtokIndx); Serial.print("Answer Text C: "); Serial.println(answertextC); Serial2.print("page1.b2.txt=\"" + Str, strtokIndx); Serial.print("Answer Text D: "); Serial.println(answertextD); Serial2.print("page1.b3.txt=\"" + Str, strtokIndx); Serial.print("Correct Answer Text: "); Serial.println(correctanswertext); } } ////////////////////, strtokIndx); Serial.print("Learning Path ID: "); Serial.println(learningpathid); strtokIndx = strtok(NULL, strtokIndx); Serial.print("Question Number "); Serial.println(questionnumber); strtokIndx = strtok(NULL, strtokIndx); Serial.print("Question Text: "); Serial.println(questiontext); Serial2.print("page1.t0.txt=\"" + St, strtokIndx); strtokIndx = strtok(NULL, take that integer (of differing lengths for different tags) and pass it to an ESP8266 NodeMCU 12-E using serial communication, the player answered incorrectly. Maybe we should show the correct answer on the Nextion."); Serial2.print("page 4"); Serial2.write(0xff);, the player is correct! Good job!"); Serial2.print("page 3"); Serial2.write(0xff); Serial2.write(0xff); Serial2.write(0xff); //brea, tx void setup() { Serial.begin(9600); WiFi.begin(ssid, What is the first letter of the alphabet?, where it is parsed and sent to a Nextion touchscreen display to present a simple quiz game appropriate to the tag scanned in step 1. Differen

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74f269 counter getting very hot

Post author By How To
Post date March 14, 2021
No Comments on 74f269 counter getting very hot

Tags and connected these directly to GND. Please tell me what I've done wrong. The components are soldered on a PCB that I had made by JLCPCB, Hi I'm a DIY enthusiast and I got stuck with the circuit that I designed. The counter is getting very hot from the moment It's powered up. I

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troubleshooting tinyprog when programming TinyFPGA BX: [Errno 19] No such device

Post author By How To
Post date March 14, 2021
No Comments on troubleshooting tinyprog when programming TinyFPGA BX: [Errno 19] No such device

I am using the TinyFPGA BX for the first time, and tinyprog crashes when I try to program the board. First, I run apio build, and that seems to work fine. But then I try to program the FPGA with tinyprog: $ tinyprog -p hardware.bin TinyProg CLI ———— Using device id 1d50:6130 Only one board […]

Tags 0 Mar 12 17:34 tty drwxrwxrwt 2 root root 40 Mar 11 11:28 shm brw-rw---- 1 root disk 7, 0 Mar 13 15:45 ttyACM0 crw-rw-rw- 1 root tty 5, 15 Mar 11 11:00 loop15 brw-rw---- 1 root disk 7, 2 Mar 13 15:45 ptmx drwxr-xr-x 2 root root 4420 Mar 13 15:45 char drwxr-xr-x 4 root root 80 Mar 13 15:45 serial crw-rw----, 3 Mar 11 10:59 loop3 lrwxrwxrwx 1 root root 3 Mar 11 10:49 cdrom -> sr0 $ So I'm guessing that ttyACM0 is the TinyFPGA BX? Normal, and I followed the instructions in the TinyFPGA BX User Guide to install the TinyFPGA BX software. Additional Information: Here are the mos, and that seems to work fine. But then I try to program the FPGA with tinyprog: $ tinyprog -p hardware.bin TinyProg CLI ------------, and tinyprog crashes when I try to program the board. First, another exception occurred: Traceback (most recent call last): File "/home/ppelleti/.local/bin/tinyprog", d) OSError: [Errno 19] No such device During handling of the above exception, I am using the TinyFPGA BX for the first time, I run apio build, in __init__ self.wake() File "/home/ppelleti/.local/lib/python3.8/site-packages/tinyprog/__init__.py", in cmd self.ser.write(bytearray(cmd_write_string)) File "/home/ppelleti/.local/lib/python3.8/site-packages/tinyprog/__init__.py", in main fpga = TinyProg(active_port, in sys.exit(main()) File "/home/ppelleti/.local/lib/python3.8/site-packages/tinyprog/__main__.py", in wake self.cmd(0xab) File "/home/ppelleti/.local/lib/python3.8/site-packages/tinyprog/__init__.py", in write n = os.write(self.fd, in write raise SerialException('write failed: {}'.format(e)) serial.serialutil.SerialException: write failed: [Errno 19] No such device $, in write self.ser.write(data) File "/home/ppelleti/.local/lib/python3.8/site-packages/serial/serialposix.py", it found the board and the bootloader is up to date., line 209, line 242, line 250, line 324, line 621, line 655, line 66, line 8, progress) File "/home/ppelleti/.local/lib/python3.8/site-packages/tinyprog/__init__.py", tinyprog says: $ tinyprog --update-bootloader TinyProg CLI ------------ Using device id 1d50:6130 Only one board with activ, using it. All connected and active boards are up to date! $ So assuming I believe tinyprog, using it. Traceback (most recent call last): File "/home/ppelleti/.local/lib/python3.8/site-packages/serial/serialposix.py"

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74f269 counter getting very hot

Post author By How To
Post date March 13, 2021
No Comments on 74f269 counter getting very hot

Tags and connected these directly to GND. Please tell me what I've done wrong. The components are soldered on a PCB that I had made by JLCPCB, Hi I'm a DIY enthusiast and I got stuck with the circuit that I designed. The counter is getting very hot from the moment It's powered up. I

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What kind of PLL is used to recover the clock from E.G. USB 2.0 data stream

Post author By How To
Post date March 13, 2021
No Comments on What kind of PLL is used to recover the clock from E.G. USB 2.0 data stream

I would like to create a communication protocol to connect two FPGAs. I would like it to be fairly fast, (a couple of 100s of Mbps) but only use a single differential pair. This kind of thing is possible. USB 2.0 uses a single differential pair, and the receiver can reconstruct the clock because the […]

Tags (a couple of 100s of Mbps) but only use a single differential pair. This kind of thing is possible. USB 2.0 uses a single differential pair, and the receiver can reconstruct the clock because the data has been 8b/10b encoded with enough edges to synchronise the clock. With a fast, at some point there will need to be some kind of hardware clock recovery circuit. I am trying to select an FPGA which can do this, but I'm assuming that they aren't suitable for this. Question: When I am looking at the datasheet for an FPGA, but my problem is that I don't know the name of this kind of clock recovery function. Most FPGAs have PLL blocks, I would like to create a communication protocol to connect two FPGAs. I would like it to be fairly fast, If I want to push the clock rate up higher, what are the keywords I should be looking for that mean this FPGA is capable of recovering the clock from a high speed data stream on a singl

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Are there any Ardunio compatible Microcontrolers with integrated OP-AMPS?

Post author By Marcia D.
Post date March 13, 2021
No Comments on Are there any Ardunio compatible Microcontrolers with integrated OP-AMPS?

Are there any Ardunio compatible Microcontrolers with integrated OP-AMPS? For example, PIC® microcontrollers has the PIC16F527 and PIC16F570, an 8 bit MCU with integrated op-amps. Im wondering if there is anything like that for MCU supported by the arduino family of microcontrolers.

Tags an 8 bit MCU with integrated op-amps. Im wondering if there is anything like that for MCU supported by the arduino family of microcontrolers., Are there any Ardunio compatible Microcontrolers with integrated OP-AMPS? For example, PIC® microcontrollers has the PIC16F527 and PIC16F570

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74f269 counter getting very hot

Post author By How To
Post date March 13, 2021
No Comments on 74f269 counter getting very hot

Tags and connected these directly to GND. Please tell me what I've done wrong. The components are soldered on a PCB that I had made by JLCPCB, Hi I'm a DIY enthusiast and I got stuck with the circuit that I designed. The counter is getting very hot from the moment It's powered up. I