Nieuw project Hulp nodig?
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mfc
mfc 4 uur geleden
Interesting -- thanks.  I should perhaps go back and test it again -- but I do not think that at either end of the P2 setting I got any sounds other than when there was a signal.  This signal was two small keys jangling together -- which caused sound from the speaker (and 'signal' LED) 7m away from the detector.    I have never heard any 'spurious' sounds from the speaker.  Should I have heard 'unexpected' sounds at some point? (But yes, I can think of many improvements to the project -- I'm not an analogue person, but would add USB-C charging of an internal battery, maybe an SD card to record signals, perhaps bluetooth support for connecting headphones or a martphone app...)
Bat detector with amplitude recovery
Aubinais
Aubinais 5 uur geleden
Hi, Why do you discuss about my nice CUDDLY mouse inside this trap ? It's ELECTRONIC PROJECT to describe LoRaWAN : a node, a gateway.... You will use this project for your mailbox... Best regards Jennifer  
My mouse is connected to the Wide Area Network !
lux36
lux36 9 uur geleden
In order to enhance 0/1 ratio compensation, I did some improvements on the MCU firmware. The 0/1 ratio is now trimmed at the end of every cluster. The flash program memory address Z=0x00AE contains a constant (now set at 0x24A3) that enables very precise 0/1 ratio trimming.  After all the adjustments of S5,S6 and S7 with help of BSA, the precise trimming of 0/1 can be done by changing the 16-bit value at 0x00AE - increasing this constant increases the number of ones, decreasing it increases the number of zeroes. For even better NIST testing results!
Random Number Generator [150116]
ABB
ABB 11 uur geleden
I think you have missed one factor that can make the illogical logical: the law. There is a legal requirement for facilities where food is produced to control pests, and to make sure that dead vermin are removed within 24 hours. Non-compliance is expensive, a facility could potentially be locked down for a period of time after a violation. This is what makes the business case for the 'smart' mouse traps, and indeed it is already being commercially exploited, see for instance https://www.xignal.com/products/xignal-mousetrap.  On a tangent, it is probably more 'humane' to kill a mouse than to catch it alive. The mouse will experience a lot of stress, starve quite quickly, and will probably die shortly after being released anyway...
My mouse is connected to the Wide Area Network !
TonGiesberts
TonGiesberts 16 uur geleden
From the text: “IC3B is configured as a Schmitt trigger which produces a square wave output from the input signal. The Schmitt trigger adds a variable amount of hysteresis to the input signal via R23 and P2, and this prevents small fluctuations (mainly noise) of input signal (around the reference voltage) causing false triggering.”   So, if the signal form the microphone is quite large P2 will have no effect. A weak signal can be too low for the hysteresis and there’s no square wave or is not entirely characteristic for the bat signal. The modulation is processed separately. P2 is not a linear volume control, but its setting can be the reason weak bat signals are not audible. No or a too small hysteresis, set by P2, will cause noise to cloud and distort the audible signal. The hysteresis should be set as small as possible. Without a signal the speaker than only occasionally makes a sound. Looking back at the circuit, maybe putting an automatic gain microphone amplifier before creating the square wave would have been a better solution? And maybe it’s control level can give some information about the distance of the bat? Just a thought, food for thought…  
Bat detector with amplitude recovery