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1
Robotics / how to make a microplastic det...
Last post by TIMO11 - Today at 05:50 pm
what type of sensor should i use whose function is modifiable through coding?
i just wanted to make a microplastic detector sensor for our research.

seeking for help. thank you
2
General Electronics / Re: 4 - 20 mA power supply.
Last post by Grumpy_Mike - Today at 05:49 pm
Quote
my understanding is that they -linear- will not present noise problems ...
No all components generate noise. It is just that a linear regulator generates less noise than a switching one.

Capacitors on a linear regulator are not optional they must be used otherwise they will oscillate.
3
Displays / Re: Use of 2.4" Transparent OL...
Last post by VosemGov - Today at 05:49 pm
Hello, do you reccomend the DUE or M0? I can't find any suppliers of M0 that ISNT pro so was was wondering DUE vs M0 PRO. Many Thanks
Thomas
4
There are IC boost converters, that support input voltage below 0.6V.
https://www.mouser.com/Semiconductors/Integrated-Circuits-ICs/Power-Management-ICs/Voltage-Regulators-Voltage-Controllers/Switching-Voltage-Regulators/_/N-6j76f?Rl=6j76fZgjdhhpZ1yjepzaZ1yc9wa0SGT

Try "energy harvesting" as google search pattern, there could be some modules on chine i-net market.
5
General Discussion / MOVED: Trackeo Arduino
Last post by gpb01 - Today at 05:46 pm
6
Hello everyone,

I have this barcode scanner from Datalogic, QD2310 (manual), connect it to a USB host shiled (Sparkfun 09947) stacking with Arduino UNO.
I ran the board_qc sketch and passed the tests, below is the result for USBHID_desc sketch:

Code: [Select]

Start
0000: 05 8C 09 02 A1 01 09 12 A1 02 85 01 15 00 26 FF
0010: 00 75 08 95 01 06 A1 FF 0A 06 A2 82 02 01 95 02
0020: 0A 08 A2 82 02 01 95 03 05 8C 09 FB 09 FC 09 FD
0030: 82 02 01 95 38 09 FE 82 02 01 25 01 75 01 95 08
0040: 09 FF 81 02 C0 09 15 A1 02 85 02 26 FF 00 75 08
0050: 95 01 06 A1 FF 0A 02 A2 82 02 01 25 02 95 01 0A
0060: 01 A2 82 02 01 26 FF 00 95 01 09 00 82 02 01 95
0070: 01 0A 07 A2 82 02 01 95 3B 0A 03 A2 25 01 75 01

Usage Page Bar Code Scan(8C)
Usage
Collection Application
Usage
Collection Logical
Report Id(01)
Logical Min(00)
Logical Max(FF00)
Report Size(08)
Report Count(01)
Usage Page Undef(A1)
Usage
Input(00000010)
Report Count(02)
Usage
Input(00000010)
Report Count(03)
Usage Page Bar Code Scan(8C)
Usage
Usage
Usage
Input(00000010)
Report Count(38)
Usage
Input(00000010)
Logical Max(01)
Report Size(01)
Report Count(08)
Usage
Input(00000010)
End Collection
Usage
Collection Logical
Report Id(02)
Logical Max(FF00)
Report Size(08)
Report Count(01)
Usage Page Undef(A1)
Usage
Input(00000010)
Logical Max(02)
Report Count(01)
Usage
Input(00000010)
Logical Max(FF00)
Report Count(01)
Usage
Input(00000010)
Report Count(01)
Usage
Input(00000010)
Report Count(3B)
Usage
Logical Max(01)



Now the scanner doesn't work when I connect it to the USB host shield, while it scans fine if connected to a PC. Based on what I read in the manual, it is in disabled state when connected to the USB shield (I can only get out of disabled state to programming state, but not actually scanning codes).(attached 1)

Some of my guesses and what I have tried so far:
  • Need to set up a different interface type when connecting to USB host shield. I tried every type in the Manual, none of them worked.
  • By every type, I meant the default setting of every type. Maybe the scanner requires further config than default in order to work with the shield. In such case, what is the right interface to pick?
  • Could it be the sketch has to wake up/enable the scanner from the disabled state? Maybe this scanner need a driver to be installed on the host shield?

Any help is very much appreciated! Thank you.

Danny 


7
Software / Re: sketch complesso non funzi...
Last post by gpb01 - Today at 05:45 pm
Allora,
intanto nella sezione di lingua Inglese si può scrivere SOLO in Inglese, quindi, questo tuo post scritto in Italiano è stato spostato qui, ma per il futuro presta più attenzione.

Poi, stiamo ancora aspettando che tu faccia quanto ti è stato richiesto QUI ... pertanto, questo tuo nuovo thread viene temporaneamente bloccato sino a quando non avrai fatto quanto richiesto. Grazie,

Guglielmo
8
Software / Re: voltmetro con attiny 85
Last post by vince59 - Today at 05:44 pm
Leoooooooooooooo....Etemankiiiiiiiiiiiiiiiiiii................siete ancora al mare?
10
Project Guidance / Re: Distance between RF Transm...
Last post by DrAzzy - Today at 05:44 pm
Hello all,
I am doing a project on finding the distance between RF Transmitter and Receiver
I am using two 433MHz Transmitter and Receiver pair.

But max Frequency of arduino is 16MHz, is it possible to calculate the transmission and reception time of the RF module using ardunio

Suggest easy methods to find the travelling time of Rf, so that the distance can be calculated using Distance=Speed x Time.

If this is not possible, do tell a way to go about....
Both Hardware and software changes are welcome
It is well nigh impossible to do this (except for highly constrained scenarios), because the composition and geometry of the surroundings have such a strong influence on signal strength (you've probably experienced this with a wifi signal that has dead spots, even when it works in places further away), and because the signal will bounce off of surfaces, ie, it doesn't take a direct path. RF ranging is hard; I've seen RF ranging modules for sale, but they cost like $75 per module - I think they're doing time of flight, but it needs to be highly accurate and very carefully designed. I do not know how well they work.

Those 433mhz OOK receivers are particularly worthless for this, as they do AGC and are totally not meant for this. Among other things - in the absence of a signal, the automatic gain control will ramp up the gain until the noise it picks up provides a 50% duty cycle on the output pin. The way messages have to be sent is that you send a message with ~50% duty cycle, either preceeded by a "training burst" of 50% duty cycle, or repeated several times, or most often both, and then have the microcontroller pick out that pattern. (example of how I do that - it works pretty well). These also have a very low data rate - a few kbit/sec raw, under 1 kbit after overhead of sending messages multiple times and including a training burst.
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