# All Questions

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### Why do I get gibrish output to the serial monitor of my arduino mega 2560?

All - Why does my Arduino 2560 report text that looks like this: I©ä I©ä !11<]=I1)!11<]=I1)!11<]=I1!11<]=I1)!11<]=I1©ä é ©ä I©ä I©ä I©ä I© Every time I execute "spi_dev_test" ...
1answer
3k views

### I2C level shifting and protection

I am interfacing an MCU (CC1110) with Vdd of 3.3 V to a battery gauge IC (BQ27510-G2) with Vdd of 2.5 V. Currently, I am pulling the bus up to 3.3 V with a circuit that I blindly copied from a ...
1answer
627 views

### Any idea which software was used to generate these circuit diagrams?

And/or: I'm trying to choose a free schematic drawing software, and like the way these two look. I've read related questions about circuit drawing software as well. I like Fritzing, but it lacks some ...
3answers
40k views

### Potential difference across one resistor with and without a known current?

Okay imagine you have a voltage supply of 10V and one Resistor of 5 Ohms. Now find the current : I=5/10 = 0.5A So potential difference across that resistor : V=IR=10V .. which proves this statement ...
1answer
74 views

### tablet as a keyboard (bluetooth / USB) [closed]

what would it take to get a tablet to communicate with a desktop via bluetooth (or USB)? There are some programs such as remotemouse which do this through WLAN.
2answers
525 views

### problem with reading values in case

I am using ATmega32-A microcontroller and CodeVisionAVR compiler. I am able to read values from an AD7798 external ADC successfully. I am also generating wave from with an AD9833 using SPI ...
1answer
326 views

### EEG sensing of imagined speech [closed]

I am doing a project on developing a silent speech interface using eeg sensors. The equipment available is ADI powerlab kit which allows the use of three to four elctrodes maximum. My question is can ...
4answers
4k views

### Basic microcontroller + RF transmitter/receiver plausibility

I am a complete beginner (I have only gone through the beginners book to Arduino + done a few small projects). I want to know if it's possible to connect a very basic/cheap microcontroller like the ...
2answers
227 views

### grounding connection?

What's the easiest way to connect a ring terminal to the ground terminal of an AC outlet? Are there plugs you can buy that make this easy? I don't need (or want) the line and neutral wires accessible,...
2answers
708 views

### Automating the measurement of current consumption of an embedded system

I have two circuit board. 1.PCB for battery pack 2.Embedded PC with various modules. I was wondering if there could be an automated way of measuring current consumption by the embedded module during ...
1answer
107 views

### PN200 replacement

I have circuit that is calling for a PN200 PNP Transitor. However, those are not avaiable in my area. Can anyone suggest a replacement transitor. Thank you
2answers
786 views

1answer
174 views

### automatic datasheet information extraction [closed]

Does anyone know of a way to extract information from a datasheet table ? An example of what I'd like to do is automate the comparison of a given characteristic (say V_dss) from multiple MOSFET ...
1answer
2k views

### How to drive stepper motor at maximum speed with a higher voltage power supply in hand?

I had a question about "Wantai" Stepper Motor with an Arduino hooked up to an motor-shield. Looking at the spec sheets the max volts and current allowed in that particular stepper motor is 3V and 2A. ...
5answers
348 views

### Hardware Defined Byte

I would like to make a PCB that sends a specific byte of information through a usb connection. I need the PCB to be as small and simple as possible to fit into a nice thin housing. Simply put there ...
1answer
663 views

### Logic needed to read and store values

I am new to programming. I have one input signal from waveform generator. I am giving this signal to one sensor and as well as channel 1 of multiplexer. The sensor output is giving to channel 2 of ...
2answers
1k views

### Finding/Calculating LED light luminosity / power output

Is there a simple way to determine the light intensity / power output of an LED? e.g. Light output = current x F.Voltage - heat dissipation Light output = efficiency x current x F.Voltage I can't ...
2answers
2k views

### Floating voltage measurements

Is there a very cheap way to measure several voltage differences of 0.1V to 10V (to ~1% accuracy at 10Hz, say), where each pair of measurement terminals may be tens of volts away from the ground of ...
1answer
464 views

### Using impulse response to control the system

This post by Olin Lathrop is rather inspiring. The system response is the convolution of the control input with this impulse response, computed every control sample, which is every 500 ms in ...
2answers
504 views

### Prototyping with a very small surface mount connector/socket

I've got a Satellite modem with a connector that mates with a tiny 10pin by 10pin Samtec SS4 series surface mount connector. The question is, how would I prototype with this component? I am thinking ...
4answers
3k views

### Does there exist an IC that allows on-the-fly routing of signals?

Do there exist ICs with N input pins and N output pins which, either via EEPROM setting or via on-the-fly control by a microcontroller, allow one to route each of the N inputs to ANY of the N outputs? ...
1answer
213 views

### Need help with programming an NXTBee on a NXT Lego Mindstorm Robot

I am doing a project for work using the NXTBee NXT controlled by an arduino. But I'm a novice with programming. I am using ROBOTC and when I compile I am getting an error: Calling procedure '...
1answer
2k views

### How to drive a high-side N-channel MOSFET with low VGS?

Question first: Is there a bootstrap driver that is available in DIP, works similar to the IRS2001, but is OK with a VCC of 4-5V? I'm also a bit limited in the amount of space I have -- is there a ...
3answers
3k views

### Latching power switch question

I have the following circuit (source: EDN): I understand the basic working principle of the circuit and it works fine when it is powered from a 1.5V source. But when I power the circuit from a 9V ...
1answer
11k views

### How to read 115200 Baud digital signal on Arduino UNO?

I am a beginner to microcontrollers. I am trying to use Arduino UNO to read data at 115200 Bd. I used SoftwareSerial.h as follows. But I do not think I got correct data. Could you help me take a look? ...
2answers
3k views

### Power loss from an inductive load

A problem reads "A single phase 50 Hz generator supplies an inductive load of 5000 kW at a power factor of 0.707 lagging ... " How can there be real power loss from an inductor?
3answers
1k views

### Can we give a bipolar signal to ADC of ATmega88?

Can we send a bipolar signal to the ADC of ATmega88? We know that an analogue signal has a positive value as well a negative value. So can an ADC take a negative value or does it just take the ...
3answers
4k views

### Is this the right way to mount a 2N3055 or any TO-3 form on a heat-sink?

Top view: Bottom view: This is the first time I'll be using a heat-sink on a transistor. Right now these are just placed together. Is the mounting correct?

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