Questions tagged [controller]

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13 views

How can a Memory Controller know when a memory is busy or completed a read/write requisiton?

I'm trying to make a memory controller to control a memory model using SystemVerilog. My memory model have a different clock domain than his controller and take different and variable times to do a ...
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1answer
49 views

Powering ETH Controllers

I began working with Ethernet controllers and there is a recurring theme that keeps confusing me. Currently I am incorporating the KSZ9031RNX into my design. The data sheet calls for digital and ...
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2answers
71 views

Looking for a button-controlled on/off PMIC akin to those in laptops [closed]

I'm designing a circuit for a custom event console (SMPS', chip reader, screen, controllers, NFC,..) which I would like to power on/off in the same way a laptop or tablet is powered on/off (hold ...
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1answer
100 views

Does the drive strength of a GPIO pin alter with change in temperature?

In low temperatures the functionality of the I2C is being affected, but the slave is working properly and the temperature is also within limit of slave. For that reason I suspect the drive strength. ...
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49 views

How to calculate the rotation of stepper motor for winding a thread on a reel

A machine which can be used to wind the thread of exact length on a reel using two stepper motors, one for rotating the reel(Ymotor) and other one is used for traverse back and forward(Zmotor). So ...
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1answer
70 views

high current UPS ish design

This is my latest attempt to try building a ups ish system for my 3D printer the printer is custom-designed with 5 meters (no, it's not a typo) on each axis. we use MKS Gen v1.1 with custom marlin ...
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0answers
25 views

RGBW 4 channel LED strips: Do I need externalpower supply or is the LED controller enough?

Not a beginner but still a novice :) Main goal is to find out if the LED controllers I have chosen can drive my LED strips or if I need external power supply. And to understand ofcourse :) ...
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37 views

Are there cerifications needed to bring 5VDC LED Controller to the US market? [duplicate]

We are producing LED programmable controler, the power supply is 5VDC. Do we need any certification (UL or similar) for the US market?
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25 views

Help for design simple heating circuit using Temperature controller MH1210W

I have to warm at 33-37 Celsius degree a small wood box , volume 600 x500 x800 mm placed at 25 Celsius degree. For maintain this interval 33-37 Celsius degree - I can use Temperature controller ...
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2answers
107 views

Is it possible to connect a smartphone/tablet OLED screen directly as a PC monitor? [closed]

why? Why OLED? mainly because of best contrast by having no backlight annoying leakage. Why smartphone or tablet screen? because of size, resolution and price. usage requirements, previous tests, ...
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0answers
32 views

Can I connect 2 power supplies for 16 meters LED RGB strip?

I've bought 2 sets of 10 meter LED RGB strip (7.2w/m) for a room. Then I've cut them to around 8 meters each to get 16 meters. Everything seemed fine but one thing, because it's 2 separate controllers,...
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1answer
124 views

What do terms half-rate and quarter-rate mean for DRAM memory controllers?

DDR3 Memory controller are often presented as being half rate or quarter rate, but what does this mean? e.g if I have a DDR3 SDRAM that is x16, what does the half or quarter rate imply in that case ...
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2answers
210 views

DMX Control - 50W COB LED

I have a DIY project, with the aim of building an (LED-based) stage/theatre light from scratch. One of the challenges I've hit with this is getting DMX control to dim the LED. I spent some time ...
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0answers
145 views

How to connect the Peltier module to TEC W1209?

I am trying to control my Peltier module using the W1209 TEC. I set the P0 to H, so that it should provide voltage to my Peltier module until the temperature reaches the set temp. The LED turns on ...
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1answer
67 views

Designing an PCIe ethernet NIC with built in ethernet switch

I am trying to design a ethernet network card that will plug into a PCIe slot and have 2 etherenet ports visible to the user that are connected by a unmanaged layer 2 switch. My architecture ...
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2answers
66 views

Which components for flat waterproof buttons controller

I'm trying to build a waterproof controller to mount on a motorcycle, to interact with a Raspberry PI Zero. I'm looking for the best way to build something flat (it has to be mounted on the handlebar),...
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0answers
119 views

How to calculate a voltage/current controller bandwidth based on their gains Kp and Ki?

I am doing some experiments with voltage and current controllers, but sometimes my results are not matching what I expected. At the moment, to calculate the bandwidth of a controller, I am taking the ...
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1answer
203 views

Where to place a diode - DC 12v motor controller [duplicate]

I'm building a controller for a DC motor. I'm using a 12V DC motor from windscreen wipers. Here is my circuit diagram and a video of the simulation I made. https://www.youtube.com/watch?v=...
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1answer
59 views

Is it necessary to use a specific switch controller for a flyback converter circuit?

For example, this DA2077 is labeled as design for use with the NCP1027 switching controller. I have some TNY290 switches I order a while back but did not use. I do not see any problem with using the ...
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1answer
433 views

Are there any pci-e controllers that take like a SPI signal, or USB and then lets me hookup a pci-e x1 card to it?

I am wondering if such a thing exists, as I could really use one to hookup to a SoC I am designing a board around, as it would allow me to take like a pci-e tv controller, pci-e ethernet card, pci-e ...
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337 views

What happens to inverter if running motor controller without load (motor)?

Consider running a 3 phase BLDC motor controller having 20KW inverter fed by 100V whence designed for high amperage. What happens if we turn it on and start gradually increasing duty cycle of the ...
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2answers
254 views

Problem testing a DC Motor Controller

I want to build a robotic arm for a project, but I got stuck while testing the motor driver on the breadboard. I have followed the instructions from this instructable: https://www.instructables.com/...
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1answer
71 views

Spliced LED Strips with Pre-Fab Controller [closed]

I need 2 meters of high density LED strip for a project, but high density strips are often only sold in 1 meter increments. I'm thinking of buying two strips -- of one meter each -- and soldering ...
3
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1answer
877 views

Simple CAN bus design, communication issues

I am trying to get some simple communication between two boards that I've designed with an ATmega328P microcontroller and MCP2515/MCP2551 combination. The design is as follows: I have both ends ...
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0answers
129 views

dc brushless motor shuts off automatically

I'm trying to see whether my electric bike's dc brushless motor controller (input 24 V) is repairable. The problem is that when I adjust the throttle to the highest power and release, the motor ...
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2answers
31 views

Transmitter max output when checking ohms in parallel

To make my question simple and easy to understand I am giving an example below. I have an RTD (platinum 100) which change resistance with increase in temperature, for checking that rtd is showing ...
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1answer
298 views

Silly serial adder design with control unit

I have designed a serial adder, with a small control unit which is supposed to synchronize all the ff states. I'm specifically interested in the state machine that does such stuff (you can see a block ...
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1answer
177 views

4,2v 3,2w Solar panel [closed]

What is tje most efficient solution to power a 3,2w 4,2v solar panel? Addind a diode and using lifepo 4000mah battery? Or using a contoller and 4000mah lipo battery? In this case which contoller ...
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2answers
756 views

PCI Express powered fan controller

I would like to make a PWM fan controller that uses a 555 timer and be placed in a Gen 2 PCI Express x1 slot, while pulling the power from the slot as well. I'm not looking to send or receive any ...
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5answers
506 views

phase matching power supply circuit

I am trying to design an electrical generator that can supply power to my house but without cutting off the utility power supply. The idea is that I could put the generator in parallel with the ...
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4answers
4k views

Fixing electrical controller (with joystick) on Pride Quantum 600 power wheelchair [closed]

The momentary switch is bad on a Pride Quantum 600 power wheelchair. The picture is below. It turns on, but you have to hold the rubber button/switch in the correct spot with the right temperature ...
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1answer
496 views

What is Cin and Cout in this design? [closed]

I am trying to build my first circuit which is a simple battery charger: I found the first components I need ( diode, fuse and regulator) but I don't understand what Cout and Cin are in this picture. ...
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1answer
67 views

Converting -48 VDC to +12 or +24 VDC 10 Amps or more

Good day, I would like the simplest way to reliably convert -48 VDC (Telcom DC Plant -42 through -56) to either +12 VDC or +24 VDC, the crux is I need at least 10 Amps. What I am trying to do is ...
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1answer
169 views

What does the FP2108T Ic do?

I have disassembled Parts of something (I think it was an old TV or RC controller). There I found an IC with this printed on top of it: "Futaba Japan FP2108T 9175K". I am not good enough that i can ...
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1answer
262 views

PCB components identification and reference designators?

This is a motor controller for evaporative air cooler. I'm new to electronics so I'm trying to understand this chip upside down. But I have a problem with these components. 1. Q2 , I think it's ...
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3answers
3k views

How DRAM refresh cycles work?

Nano capacitors in RAM act as leak bucket and continuously lose charge. For this RAM has to be refreshed periodically in order to charge those nano-capacitors again. "During the refresh cycles memory ...
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0answers
56 views

Micro controllers with high speed switching capabilities

I am planning a ESC for use with a 5500KV brushless motor, running on duel 4 cell Lithium Polymer batteries, I have noticed that in most speed controllers they use an Atmega to control the switching ...
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4answers
1k views

Electronic switch with negative and positive voltage

I want to use a micro-controller to send data through a max232 that will convert the 0v/5v signals into -12/+12v signals. The problem with this IC is that when there's no signal, it sends a +12v ...
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2answers
822 views

How do you find the transfer function of a controller?

Below is a block diagram of the system. I thought the circle symbol with the plus and minus sign was an op-amp but I'm not sure whether that's the case. I want to find the closed loop transfer ...
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1answer
174 views

How to build an Electric Vehicle (explain like I'm five) [closed]

I'm a business major investing time to learn more about Electric Vehicles. For starters, I wanted to understand the elements that come together to make a simple Electric Vehicle, maybe a scooter. I ...
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1answer
125 views

Terabyte memory controller ICs [closed]

I am thinking of creating a PCI-Express card to support from 1TB up to 8Terabytes of RAM (for servers). I will have to modify glibc in order to use it, but it is not a problem. The problem is to make ...
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3answers
2k views

Is it possible to directly interface a MEMS ADMP541 microphone over I2S with any Microcontroller?

I have bought a MEMS ADMP541 Evalution kit to record voice samples with arduino controller MEMS microphone will produce digital o/p , I2S communication protocal My question is should I directly ...
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3answers
114 views

Looking for right component in my simple diagram

I am not electical engineer therefore stumbled upon this simple issue. In need to activate a 120VAC 1HP motor from sprinkler timer that has 4 individual channels providing 24VAC up to 400mA voltage ...
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1answer
403 views

designing PID controller using Ziegler Nichols algorithm

I'm trying to use Ziegler Nichols algorithm to design PID controller for the following transfer function: G=w^2/(2*xws+w^2), w=1 , x=0.2. so since the step response for this function is a second ...
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1answer
174 views

digital controller design and mapping analog signal to digital integer values

I have a specific situation i am trying to wrap my head around but i think it should have a general formalism to address the problem. I have designed a BiQuad controller for a buck converter and i ...
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3answers
2k views

9-pin mini-DIN - zero resistance between some pins [closed]

There's a volume knob connected to a speaker system with 9-pin mini-DIN. The volume knob contains potentiometer to control volume and is also in charge of turning the system on and off (by turning the ...
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2answers
356 views

3.3 powered microcontroller interface with 5V powered ADC

I want to use uC LPC1769 (3.3V powered) for interfacing with 5V or 3.3V powered ADC. Controller --> LPC1769 ADC --> AD7705 If we power ADC7705 with 5V, then Vref = 2.5V. But, if we power ...
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1answer
2k views

charging batteries with automatic car charger through solar charge controller [closed]

Rustic cabin off grid. Seperate wiring for 110AC and 12VDc. Using solar panel through a Steca PR1515 charge controller to charge 2 12v batteries in parallel. If not enought light (at night) to charge ...
1
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1answer
192 views

Unused Ethernet pins

I want to use the LAN9500AI controller in an application. This is a USB <-> Ethernet bridge with access to the MII interface. Since I just need the USB and MII interface, the ethernet interface (...
0
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2answers
120 views

PWM led controller

I need to control 12V/10W led brightness by a pwm signal. I know I can do it with an arduino and some TIP120 or another power transistor, but the question is, is there another method to generate a 95% ...