Loading

DIY Voice Intercom using WLAN

by TuxMan

I would like to build two devices to communicate within my own WLAN via speech based on Arduino, RasPi, ESP32 or similar. Does anyone know a project I could use? Any hint/link, etc. is welcome. I can design the housing, but my skill on the mentioned boards is not good enough to design the electronics myself.

An example for what I mean is this one:

projectable.me/i-built-a-wifi-walkie-talkie-for-my-kids-now-you-can-too/

But for my purpose it seems too complicated. I just want to make short calls like "Please come over for dinner" ... "Just give me another 5 minutes" … "Would be bad, dinner is already served" …. ;-)

View Comment

Bluetooth module for keychains?

by UncleJohn42

I'm modeling and printing custom keychains. I would like to be able to locate them with a smartphone. Can anyone point me in the right direction?

View Comment

Can't register SIM card on GSM Module (SIM800)

by abasel

I am using the following quickstart guide: https://www.ayomaonline.com/programming/quickstart-sim800-sim800l-with-arduino

I have tried different sim cards (confirming that they work by testing them in a mobile phone) but I cannot get them to register on the SIM800 module.

This is the module that I am using: https://www.aliexpress.com/item/SIM800L-V2-0-5V-Wireless-GSM-GPRS-MODULE-Quad-Band-W-Antenna-Cable-Cap/32877115526.html

The following are the AT commands and outputs:
AT+COPS=?
+COPS: (3,"VODAFONE","voda NZ","53001"),,(0-4),(0-2)
OK

AT+CFUN?
+CFUN: 1
OK

AT+CREG?
+CREG: 0,0
OK

I have checked the power supply and and that the SIM is plugged in correctly. Any other ideas?

Thanks

Arduino_Uno GSM sim800
View Comment

why is frequency of neopixel signal faster than PWM of the Arduo

by SavageRodent

hay guys.

i was playing around with an oscilloscope and decided to compare the wavelength the neopixel data sinal with that of the PWM at, what i thought should be its highest possible frequency?

I'm using an arduino uno for the neopixel signal and a arduino nano to run the a sketch (see below) for the PWM. Both boards have 16Mhz clock speed so i assumed that wouldn't be a factor.
Anyway, as u can see in the picture the neopixel data sinal (blue line) is at a much higher frequency the the PWM (yelow line).

My question is, why is this?

//PWM code
void loop() {
digitalWrite(6,HIGH);
digitalWrite(6,LOW);
}

View Comment

Missing .ino file in Marlin

by fordtek1

Hello. I'm trying to reconfigure my printers after a hard drive failure and when trying to download the 1.1.9 marlin files, the .ino file is not present in the download. Has it been relabeled or do I have a corrupt download? ANy and all help is greatly appreciated

View Comment

Mini cnc GRBL router

by cncjim4

Anyone here have a inexpensive mini cnc GRBL router that the use to make PCB boards. If you do which one did you buy and how did it work out?

View Comment

Wrong Driver for Atmega2560

by 3DPDude

Hi everyone!

I got this: https://www.amazon.com/BIQU-control-upgraded-controller-Printer/dp/B07CT9VMSV/ref=sr_1_1?ie=UTF8&qid=1545836542&sr=8-1&keywords=Tango+controller+board as an upgrade for my atmega2560 Rumba board. It was working great, it showed up in device manager as the atmega2560, and I could upload firmware to it. But now, it all of a sudden showed up as CP2102 USB to UART device, and I can't figure out how to upload firmware to it.

Any suggestions?

Thanks guys!

View Comment

what determines a stepper motor's voltige?

by SavageRodent

hay guys.
i've been browsing ebay for Nema-17 stepper motors, for a future project. The motors i'm looking at are all of a similar size
but have big differences in specification. I'm struggling to understand the relationship between the inputs and outputs.
Below are few key details for a couple of motors i looked at. Motor 2 has far higher voltage, draws twice the the current and yet has practically the same holding torque. can someone please explain this to me?

motor 1:
38mm length
3.96V
0.9A
0.4N.M Holding Torque

motor 2:
40mm length
12 V, 24 V
2A
45Ncm Holding Torque

View Comment

Looking for a good inexpensive Soldering Iron

by cncjim4

Right now I am using a cheap Wall Lenk L25 soldering Iron. I am looking to buy something a bit better. I don’t want to spend a lot of money on something that is use for my hobby. I am looking at the Weller WLC100 40-Watt Soldering Station Amazon has it for about $38.00. What do you people recommend for a good inexpensive Iron .

View Comment