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User Help Web Pro

Android browser compatibility checking

Apart from the suggestions made in How can I see what my web site looks like in various browsers?, I have actively downloaded the 3 major browsers (Chrome, Firefox and Internet Explorer) and I check my website designs using the actual browsers along with Edge which is now provided automatically in Windows 10. For belt […]

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Ask Electrical Engineering Engineering

how to recognize interupt handler on register level of efr32fg14

in the code bellow we have interrupt functions which play with the IF register. And there are functions called USART0_RX_IRQHandler functions which we dont call in the main() and in the function itself there is USART_IntDisable which does usart->IEN &= ~flags. But i cant see no where in the code bellow to activate USART0_RX_IRQHandler when […]

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Ask Electrical Engineering Engineering

How to detect load is connected to a MOSFET?

How can I detect a load is connected to a MOSFET and report that back to the MCU? So the MOSFET can be ON or OFF, but I need to know in both situations if there’s something connected or not. NOTE: if it involves an additional GPIO, then id like to add an indicator LED […]

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Ask Electrical Engineering Engineering

differential instrumentation amplifier in LTspice not working

I was trying to simulate an instrumentaion amplifier in ltspice. the problem i am having is the output when measured across C1 is wrong. since i have an amplification factor of 11, i was expecting to get (V2-V3)*11. which should be 11V. but i get 5.5V instead. if i change the power supply for the […]

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Arduino Ask Engineering

Can’t upload sketches or flash Nodemcu 1.0 12E (CP2102) but have drivers and responds to RST on Serial monitor

I’ve been trying to get my nodemcu working for months and tried countless online references but none worked. I’m using the Arduino IDE to upload sketches and always get the error "Timed out waiting for packer header" Here’s my setup. I’m trying to upload the example blink code for the nodemcu 1.0 12E. My board […]

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Ask Chemistry

Activation Energy and Equilibrium Position

Is the reaction direction with the lower activation energy favoured at equilibrium?

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Cryptocurrency Ethereum Mastering Development

Creating contract instance fails because of missing interface definition in ABI. Am I using the wrong ABI? [closed]

I am trying to interact with a smart contract (the HNY token contract in particular https://blockscout.com/poa/xdai/address/0x71850b7E9Ee3f13Ab46d67167341E4bDc905Eef9/contracts) on the xDai chain. I am trying to create a contract instance with ‘new web3.eth.Contract(abi, address)’ where I took the abi and address from the link above. However, I get the error ‘Error: You must provide the json interface […]

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Mastering Development

Why are simultaneously executing tasks failing and causing Ignite to freeze?

OS: Ubuntu 18.04 Apache Ignite: 2.8.1 Other info: Flask Application – for API endpoints pyignite – as thin client for Apache Ignite Data Loaded: 5 tables: A: 10 million records B: 37.5 million records C: 10 million records D: 25.3 million records E: 5.5 million records Total taking up 29GB of space in Ignite Persistence. […]

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Mastering Development

How to shift the contents of a memory location left 1 bit to another memory using z80 assembly language

Example , left shifting 1 bit from location 1900H and store in location 1901H , and empty bit positions are filled with zero

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Mastering Development

Android’s TMemo (Firemonkey) Issue and strange behaviour

Using Tmemo in my application, to allow the user to enter notes, I found that when editing the text or using the backspace key, very strange things happen. For example, it’s not possible to move the cursor to the end of the text, or deleting some letters of a word, in this case, the text […]