Questions on the implementation of Wi-Fi (802.11) hardware. Note shopping questions are off-topic.

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2answers
41 views

How can i make a 3.3v ouput from 9v battery?

I'm a newbie in embeded system and basic electronics ,Yesterday i purchased a esp8266 wifi module from amazon along with ftdi usb driver i'm also have an Arduino uno, esp8266 require 3.3 v . Arduino ...
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0answers
9 views

RN 171 (RN-XV Wifly) scan and connect to another IBSS Ad-Hoc Network

My setup is as follows: A Raspberry Pi + Realtek WiFi Dongle. It is configured as an IBSS Ad-Hoc Network (SSID = "pi-adhoc"). This works so far. I can find this network and connect to it from my ...
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0answers
11 views

Is it possible to collect all RSSI values for the wifi client(connected devices) from AP'S [migrated]

I want to collect periodically the RSSI values of all connected devices in a certain Wi-fi area which I will use them in my application to monitor the Wi-Fi area. I am asking. Is it possible to ...
0
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0answers
4 views

Using a wifi adapter with the raspberry pi [migrated]

a friend of mine recently got me a wifi adapter to use with my raspberry pi, unfortunately, the driver comes in the form of a CD. Does anyone know whether I can get around this somehow? Can I get a ...
0
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1answer
39 views

Yagi gain reduction when using off frequency (2.3Ghz WiMax system using 2.4Ghz WiFi Yagi)

I have a new WiMax 2.3Ghz broadband service that has marginal reception. As the frequency 2.3Ghz used is close to WiFi I am thinking I can use a cheap WiFi yagi instead of a much rarer (and expensive) ...
3
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1answer
71 views

Why does the 802.11b DSSS signal have 22 MHz of channel width? How does the information get spread over that width? [duplicate]

This topic has got me so much confused. In terms of Wi-Fi, when we say the 802.11b has 22 MHz of Channel Bandwidth, what does it mean? When we refer to a particular Channel No. say Channel 1, it has ...
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0answers
25 views

ESP8266 servo controler

I am building a small application, that should be able to connect over wifi to server, pull some data and turn a connected servo accord the result. The system should be powered on battery. Is this ...
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0answers
82 views

ESP8266 sends garbage data always on reset

I am assigned to do a project on IOT using the ESP8266 wi-fi module. For refashing the firmware I also bought a USB-TTL converter and installed the necessary drivers on my PC I connected the RX and ...
0
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1answer
48 views

Transparent Wi-Fi module with RMII input

I need to convert a Ethernet-connected embedded project with wireless connection. I'm looking for a low-cost (main constraint, less than USD $15) and most open-source/-hardware possible Wi-Fi bridge ...
0
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1answer
59 views

Can you use an directional Antenna to sniff packets at a very long distance? [closed]

A normal wifi dongle can be configured in monitor mode to sniff out packets . What determine the range of distance the wifi dongle can sniff out? is it determined by what protocol the wifi dongle is ...
0
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1answer
58 views

Do wireless amplifiers work in both directions?

I'm especially wondering about wifi aplifiers (2.4GHz and 5GHz). I have a couple of very basic questions about them. (I hope this is not too much for a single question): Are there special signal ...
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0answers
14 views

3d multilateration with unknown, but proportional, distances

I am trying to position a digital unit using a number of receivers by recording the signal strength at each receiver. However, since not all digital units will emit with the same signal strength I ...
3
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2answers
143 views

ESP8266 WiFi module light switch

Info So I've decided to hop on the ESP8266 WiFi module bandwagon and build a light switch with a couple of differences. 1) the light switch needs to go in the wall and be the same size as the ...
0
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0answers
34 views

Intel Edison External WIFI/BT Antenna Certification

I want to bring my device with Edison using external WIFI antenna for FCC certification. The test lab asked me how to set continuous Tx and Rx, but I can't find any instruction from Edison developer ...
2
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3answers
96 views

Hardware for IP Camera Project

I intend building a custom IP camera for home use, project goals are: Videos are stored remotely in real time (storage somewhere else in home or cloud server) Live steaming from internet Video data ...
1
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1answer
33 views

Wifi uplink air interface

Most Wifi 802.11 standards use OFDM to achieve high data rates wirelessly. However, I was told OFDM is not suitable for uplink as it requires expensive and inefficient amplifiers which are not ...
0
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1answer
32 views

OFDM with CSMA/CA

Most Wifi standards (e.g. 802.11a) use OFDM for orthogonal frequency multiplexing, i.e. assigning different subcarriers/frequencies to different users. On the other hand, it says CSMA/CA is used to ...
2
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1answer
103 views

Avastar SP88W8782 wifi module Pinout 12 pin usb

I just opened a HP wifi driven printer and found an Marvell Avastar 88W8782 Wifi Module with 12 Pin connector to the main board. From googling I found that this is a USB interface driven module but I ...
0
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2answers
78 views

Wi-Fi vs Bluetooth communications to android phone

I am interesting in getting a device, (bare metal micro-controller with sensors), to communicate to an android phone. The device is not wearable and the power difference between Bluetooth and wifi as ...
0
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1answer
62 views

Wireless data transmission options for streaming video

I am in the initial stages of planning a project that involves the wireless transmission of data between either an Arduino or Raspberry Pi and a base computer/RPi. Data transmitted includes the state ...
0
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1answer
75 views

How to determine range of wifi module

I am starting to plan a project that involves either an Arduino or Raspberry Pi (haven't decided yet) connected to a number of sensors. The unit will be located outside, battery powered and will send ...
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1answer
66 views

Convert USB3 to WIFI [closed]

What methods could be used to convert USB3 communication to WiFi, when there is no access to the device's OS?
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2answers
119 views

Design Consideration: Cortex M0 vs Cortex M4 for IoT Applications [closed]

I'm designing an IoT Device with many sensors which are going to be integrated using serial interfaces like UART, SPI, I2C and so on. For communication capabilities, I plan to use Wi-Fi (IEEE 802.11). ...
2
votes
1answer
61 views

Adding Wi-Fi to a TCP/IP application that is already running with Ethernet

What to do if you have an Ethernet application that is already up and running with TCP/IP functionality and now you want to add Wi-Fi. Most of the Wi-Fi modules available have embedded TCP/IP stacks ...
0
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1answer
94 views

Can't reflash esp8266 - 12E after many attemptions

I have the following circuit for updating custom firmware to my esp8266-12e module. I've tried many variations for GPIO0, GPIO2, but none of them works. I use the Arduino IDE to make hex files, and ...
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2answers
70 views

Bluetooth based Sensors to the Cloud, processor choice?

This is a pretty broad question, but I'm curious to hear how people would go about this and what parts they would use to do the heavy lifting. Imagine you had a bluetooth module, it works fine and ...
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2answers
55 views

Effect of WiFi hotspot usage on mobile phone circuitry [closed]

Despite the fact that mobile phones come in wide a variaary and form different suppliers and with different software, most mobiles todays have a WiFi hotspot feature that can convert a mobiles' ...
0
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0answers
73 views

Effect of copper thickness in PCB antenna design

I have been going through TI's design note DN0007 recently which describes the inverted F antenna design supposed to be used with 2.4 GHz systems. This is the antenna I am talking about: Design ...
3
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1answer
61 views

Effect of bad antenna design on chip behaviour

I have designed a PCB for TI's cc3200 using recommended design specifications. The chip performs correctly when i use functionalities like GPIO read/ write, UART communication, but as soon as i use ...
1
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1answer
38 views

Wifi throughput and relationship with wifi range

I've a question about how are related Wifi throughput and it's range. For example, if we assume a simply antenna like PCB antenna or ceramic antenna and a wifi frequency of 2.4Ghz, what is a partical ...
0
votes
1answer
118 views

What is the best way to connect over 2km distance without line of sight using wireless? [closed]

I need to connect my home internet to the farm. Home has internet connection but farm is in forest area so cannot have internet connection. So I need to setup connection to share my home internet to ...
-2
votes
1answer
122 views

How do we communicate between a pc and a beaglebone-black using wifi?

I have been working on a beaglebone-black based mini project which involves displaying a GUI on a screen and displaying sensor values. I have been using python to create the GUI and also interacting ...
0
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2answers
69 views

WiFi access point location estimation

Is there any way to determine accurate position of WiFi access points. I have come across many ways about estimating user's position by using received RSSI but can we find the actual physical location ...
2
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2answers
477 views

What module to look for if I want to tell if there's Wi-Fi in the air? [closed]

I'm working on a mobile device. Essentially it has nothing to do with WiFi communication. It doesn't transmit any data over the air. It has to know however if it's in- or outside of the range of a ...
1
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1answer
131 views

Will this antenna even help?

I am using ESP8266 (esp-07) in a project. I was facing connectivity/range issues with my old router. So, I am planning to use a PCB antenna with esp. This is how it looks: Here is the mechanical ...
1
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0answers
103 views

Integrated WiFi antenna in metal box (ESP8266 in coffee machine)

I'm currently planning a project involving a ESP8266 inside a coffee machine. However, I do not know if the internal antenna is sufficient to communicate with the outside. Alternativly, I could use a ...
1
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0answers
47 views

Mechanism of a pringle antenna?

I'd like to DIY a WIFI antenna out of a pringle can. Although there are lots of info online to teach you how to assemble one, but none of them explains the mechanism of it. My questions: 1) What is ...
2
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2answers
339 views

Sending smtp email from microcontroller

This may not be in the right location, so tell me and I'll move it. I am a recent EE grad and I was hired to build a system that exists on a SoC with a simple 32-bit processor. The system basically ...
1
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1answer
68 views

How to avoid multipath noise

I have a device that broadcasts BLE advertisments, I am trying to measure the RSSI level of the broadcasts on another device (I am trying to do indoor triangulation for location estimation) When I ...
0
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1answer
87 views

Bluetooth versus WiFi

Why there are two communication standards, Bluetooth and WIFI? Why not used just one, when they both works in the same 2.4 GHz band?
0
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2answers
268 views

Is cloverleaf antenna good for WIFI?

Is a cloverleaf antenna (that is used for FPV applications) good for home wifi? If not, why?
2
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0answers
636 views

Indoor direction using wifi ESP8266 RSSI

Good day. Am trying to build a small device that is able to locate the direction of object indoor . not location, only direction. I bought ESP8266E wifi chip and arduino the ESP8266 is the receiver ...
0
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2answers
37 views

Ways to communicate GPS coordinates to a central server wirelessly from a wearable device

I am currently looking at designing a wearable device for a client, which can communicate GPS coordinates back to some sort of central server (to then be sent out to other communicating devices such ...
1
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1answer
74 views

Is a Wifi antenna both a transmitter and a receiver?

I only have one antenna on my Wifi card so I am assuming it is both the receiver and the transmitter, but I can't quite wrap my head around it. Does it constantly switch between being a receiver to ...
1
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0answers
72 views

PIC18F microcontroller supply pins getting shorted when WiFi is running

I am working on a PCB with PIC18F26K22 which connects to a Redpine Wi-Fi module through UART. I initially checked if PIC works with a simple LED blinking program with internal oscillator and it ...
1
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0answers
61 views

MRF24WG0MA driver

I have a working embedded design that connects to the internet using an ethernet connection. I'm using an MCU that has the Treck TCP/IP stack running on it, wich drives the RJ45 connector but now I ...
0
votes
1answer
53 views

What exactly is the signal strength seen in API for BT/WiFi receivers?

I understand why dBm is used and how it's calculated and what the usually negative value means. However what I'm interested is of what exactly this measurement is ? Is this the absolute signal ...
0
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1answer
144 views

Is it possible to use a USB Wifi dongle with STM32F429I Discovery board?

I have been using wifi modules like ESP8266 and EMW3162, but this increases the load of work. I would like to use a usb wifi dongle (because discovery board has extra usb interface). Is it possible? ...
0
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1answer
76 views

Mobile WIFI: how close can mobile devices be placed and still have a functional WIFI connection?

I wish to run a large array (50+) of hacked Android phones as a computing cluster. They will need to be networked so I plan to use their built-in WIFI radios to talk over a single WIFI network. (I ...
0
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1answer
46 views

Radio Control car telemetry

I am trying to get some input on the feasibility of this project. I will have a radio controlled car. The car will have sensors that will output data like acceleration, gyro something like 6DOF. A ...