All Questions
Tagged with ttl microcontroller
25
questions
-3
votes
1
answer
131
views
Definitions of Serial TTL UART MCU acronyms
I was looking for a comprehensive list of terms and acronyms concerning serial peripheral communication including their descriptions and, crucially, how they relate to each other. Since this site ...
- 256
0
votes
2
answers
583
views
How do I know if it's RS232 levels or TTL levels
I have a random device: GT MEDIA V8 Finder Pro. I would like to communicate over its console port.
Here are some pictures of its mainboard. Here is the area around the console connector:
I have no ...
0
votes
0
answers
285
views
ESP32-C3-WROOM: error flashing chip
I am developing an ESP32-C3-WROOM custom board, but when I tried to flash the chip using UART (FT232D USB-TTL) and Arduino IDE, I got the message "A fatal error occurred: Failed to connect to ...
1
vote
1
answer
2k
views
What are the output logic levels of this STM32?
I am struggling getting my head around the input and output logic levels, mostly the output levels of this STM32 (STM32F446xC/E).
This table shows the output logic levels as dependent on if it is a ...
- 161
0
votes
1
answer
256
views
Is powering the Nuvoton N76E003 with just the UART0 pins legitimate?
I bought an 8 channel USB/UART controlled relay board from banggood.com:
https://www.banggood.com/2-in-1-DC-5V-8Channel-USB-Serial-Port-Relay-Module-UART-RS232-TTL-Switch-Board-CH340-for-Windows-Linux-...
user97497
1
vote
2
answers
1k
views
Flashing program into microcontroller, usb-ttl, idea behind?
I have limited knowledge on this topic(MCUs, communication protocols, etc.). I back then worked with an STM32 MCU and did some UART(or USART, can't remember) communication between a PC and the MCU. ...
- 2,106
2
votes
2
answers
1k
views
Mux UART with 74xx Multiplexer
I have a legacy LPC MCU with 2 UARTs only. One of these UARTs is reserved for different functions such as IAP and RS232. So basically, I have one UART available only.
For an experimental project I ...
0
votes
1
answer
170
views
Driving a ThorLabs piezo controller with TTL external input
I am trying to drive a ThorLabs piezo controller (https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=2421&pn=KPZ101) with an external +3.3V TTL signal provided by a microcontroller (using ...
- 31
10
votes
4
answers
6k
views
Buffering a Digital Microcontroller Signal for Connecting to an Optocoupler
I frequently work on projects in which I use optocouplers for isolating digital +5VDC control signals (for example, from a microcontroller) from the rest of the circuit. However, since these work by ...
- 747
3
votes
2
answers
11k
views
Should I connect unused STM32 pins to ground?
I'm designing some circuit using STM32L152RBT6 microcontroller. I'm using STM32L-DISCOVERY scheme as a reference of good STM32 practices. I've noticed that free pins of programmer's MCU aren't ...
- 133
0
votes
1
answer
206
views
Rs232 connection to gyro, uC and PC
I have a question regarding RS232 communication between a VectorNav VN-100 Gyro, Mbed LPC1968 uC and PC. I am using gyro to measure the number of rotation and processing it in the uC and displaying ...
0
votes
3
answers
2k
views
220VAC to TTL converter
I'm building a circuit that sends TTL level signal to uP whether AC signal exists or not. The schematic is as follows:
Actually, the circuit almost works as I expect; however, there occurs some ...
- 105
0
votes
2
answers
1k
views
High voltage to TTL conversion
I'm designing a circuit that is going to sense the existence of high voltage DC(400V+) via microcontroller. I've already designed it for AC voltage using an optocoupler; however, I will not able to ...
- 105
0
votes
2
answers
285
views
Integrated TTL in SPDT-switch
Found a switch for a project, and want to make sure I understand it correctly.
This is the switch:
(Mini-Circuits SWMA-2-50DR+).
Now, it has a TTL driver circuit with the inputs +5V, -5V, and TTL IN....
- 167
2
votes
3
answers
591
views
Logic design to circuit -- how is it generally done?
So I've designed this CPU with purely logical components (basic logic gates), now how would I go about converting it into a circuit? I know that logical gates can be implemented using transistors, but ...
- 123
3
votes
4
answers
13k
views
Turn TTL output of logic IC into output capable of driving 50 ohm devices
I want to provide front-panel trigger signals with the microcontroller inside my device. The trigger signal will be fed via a 50 ohm coax cable to another device with a 50 ohm input.
A direct ...
- 653
0
votes
2
answers
1k
views
Minimizing voltage drop across SSR when using it to pull down a TTL digital input on another device?
I have a situation that I've run into a few times. I have a digital output card in my system that uses SSRs. I'm trying to interface to a device (referred to as my DUT from here on) that has TTL ...
- 63
1
vote
3
answers
2k
views
Interfacing VC0706 with AVR Microcontroller
I am having trouble interfacing a VC0706 Camera with only an AVR Microcontroller. I am using simple serial communication but the camera does not respond. I tried connecting it with a computer but ...
- 11
0
votes
3
answers
751
views
Solid-state Electronic switch for low level signals
I need a very simple circuit to connect a signal to one of two ways like this:
My com signal is actually a microphone input, so very low voltage, <200mV, how can I make a solid state switch that ...
- 507
2
votes
3
answers
1k
views
How do I safely connect a 74HC00 series circuit to microcontroller?
I built and simulated a circuit out of 74HC00 series ICs and want to connect it to a microcontroller (ATmega 16).
The development board I use (Atmel STK500) supplies 4.93 V (GND to VTG and GND to ...
user29239
0
votes
1
answer
7k
views
Difference between TTL I/O type vs Schmitt trigger I/O type
While reading microcontroller data sheet i came across i/o types like
i) TTL
ii) schmitt trigger.
I came to know that TTL i/o logic means 0v-0.8v -logic state 0, 2-Vcc means logic state 1 (as ...
- 271
5
votes
3
answers
2k
views
Driving LEDs / other small loads with a 74HC06 or similar inverter
I was recently reverse-engineering some firmware (and other bits) from a router, and spotted that the front panel LEDs were driven from a 74HC06 hex inverter gate chip rather than a proper LED driver.
...
- 10.8k
5
votes
1
answer
3k
views
how to interface HCPL-3700 optocoupler to an input pin of ATmega16L
I want to detect logic of the mains supply (230VAC, 50Hz) and feed the output of HCPL-3700 into ATmega16L. I read through the datasheet but could not understand how to calculate the resistor values. ...
- 1,495
5
votes
1
answer
671
views
Dual power supply confusing TTL serial?
Sorry for the vague title: I'm a bit of a noob at analogue electronics, more a logic &software guy. Basic problem is I'm sitting at the end of a cable with a USB powered Arduino trying to send ...
- 51
17
votes
2
answers
49k
views
How does TTL serial work?
I've been trying to find a good description of the TTL serial "standard" without much luck. I understand that serial transmit (TX) and receive (RX) lines idle high (at VCC) and that they drop to ...
- 2,564