15
votes
Accepted
Does the ESP8266 somehow remember wifi access data?
Yes, normally the last WiFi credentials will be saved in flash and the ESP8266 loads this data on bootup and reconnect to the last known WiFi. See https://github.com/esp8266/Arduino/issues/2843#...
- 3,626
12
votes
Accepted
WiFi Password Safety
You're actually entering into a very tricky and difficult area.
Yes, having a plain text password in your sketch is a risk. It is stored in flash as plain text. If an attacker can gain access to the ...
- 105k
10
votes
Accepted
How to allow cross-domain requests on ESP8266WebServer
Add the CORS header to every response, not only for 'preflight' OPTIONS request. The OPTIONS support is optional, but the response returning the 'shared resource' must contain the CORS header
"...
- 17.8k
9
votes
Accepted
Can I use arduino's 3.3 V output directly to esp8266?
You should search for this data yourself, but since you are saying you are a newbie I'll tell you how to find this.
First of all you should search for a document called "datasheet". On a datasheet ...
- 2,721
9
votes
ESP8266 - does it really have terrible wifi range by default?
The very first thing I notice is that your WiFi antenna is shielded by the PCB. That is the antenna is placed right over the top of the ground plane of the PCB and your range is going to be severely ...
- 3,188
8
votes
Accepted
ESP8266 Analog read interferes with wifi?
I have found that this was caused by reading the analog pin to many times in a short period of time. I replaced
ldrState = map(analogRead(ldrPin), ldrMin, ldrMax, 0, 100);
Serial.println(...
- 183
8
votes
Accepted
Analog read not working while using WiFi
The ESP32 has two ADCs. One of them, ADC2, is actively used by the WiFi.
From the IDF documentation:
Since the ADC2 module is also used by the Wi-Fi, only one of them could get the preemption when ...
- 105k
7
votes
Accepted
Serving binary file with ESP8266WebServer
It looks like you can use the send_P function to send raw PROGMEM data:
void send_P(int code, PGM_P content_type, PGM_P content, size_t contentLength);
I.e., (from what I can gather):
PGM_P favicon ...
- 105k
7
votes
Accepted
EPS8266 ESP-01: LED manipulation seems to interfere with serial communication
I would bet that the built-in LED pin is also the TX pin for the serial interface.
Check here, LED Pin section: http://www.esp8266.com/wiki/doku.php?id=esp8266_gpio_pin_allocations
LED Pin
...
- 1,149
7
votes
ESP8266 on WiFi without password, possible?
Yes, it works! You can use:
WiFi.begin(ssid, NULL)
or even leave the passphrase empty, because it is optional:
WiFi.begin(ssid)
Reference: https://www.arduino.cc/en/Reference/WiFiBegin
- 181
7
votes
How to turn off or stop Access Point network in ESP8266?
I've already solved, by using a function of the library Wifi, specific for the connections in "Access Point" mode:
WiFi.softAPdisconnect (true);
Reference:
softapdisconnect
- 293
7
votes
Accepted
How to get current WiFi signal strength?
You use WiFi.RSSI():
RSSI
Return the signal strength of Wi-Fi network, that is formally called Received Signal Strength Indication (RSSI).
WiFi.RSSI()
Signal strength value is provided in dBm. The ...
- 105k
7
votes
Accepted
how to change a const char*
that function indeed requires "const char*" as parameters
There seems to be a misunderstanding here. The method signature is:
bool ESP8266WiFiAPClass::softAP(const char* ssid, const char* ...
- 42.2k
6
votes
ESP8266 Analog read interferes with wifi?
This is an old question that has been answered, but I would like to offer a slightly more elegant solution (IMO!):
In my method which reads the analog data, I check and only read every 50 ...
- 161
6
votes
Accepted
Use ESP-01 with Arduino Uno/Nano, with the ESP8266WiFi library
You cannot use that "library". Simply because that isn't a library, that is a core. It's the entirety of the Arduino API designed to run on an ESP8266.
You can use it to program the ESP8266 directly ...
- 105k
6
votes
Accepted
ESP32 - `Brownout detector was triggered ` upon Wifi begin
Those boards have an inherent weakness in that they don't provide enough decoupling capacitance for the module.
Not all modules are quite the same, and some have more internal decoupling than others (...
- 105k
6
votes
Accepted
Arduino Library to make http post request with bearer authentication
The "Authorization" is simply an HTTP header. So add it in your request like:
http.addHeader("Authorization", token);
The value of "token" is just the string "...
- 1,045
5
votes
WiFi module ESP8266 + Arduino Uno
Since all of the data pins use 5 V, one of the solutions is to use a voltage regulator, such as LM2596.
You do not want a voltage regulator you need a level shifter.
You can buy them cheaply or make ...
- 37.9k
5
votes
Using Arduino for Industrial process
Industruino just came out a couple days ago:
https://blog.arduino.cc/2015/09/21/industruino-makes-industrial-automation-easy-now-atheart/
https://industruino.com/page/home
https://www.youtube....
- 1,359
5
votes
Difference between WiFiClient and HttpClient
WiFiClient provides a raw connection to the internet through a WiFi access point (such as your home router).
HttpClient provides a connection to a web server via an existing Client connection, such ...
- 105k
5
votes
Accepted
List of connected clients to server
The WiFiClient.h header and WifiClient.cpp source files are useful for reference.
Is the best data structure a linked list?
Probably not here. Possibly not ever. It's a load of effort to ...
- 2,181
5
votes
Accepted
ESP8266 UDP multicast doesn't receive packets
I recently had the same problem.
The unequivocal answer is that there is a power optimization (internal by Espressif) to save power, I guess, and it really creates havoc in the UDP Multicast ...
- 66
5
votes
Accepted
Can the WiFi on ESP8266 be disabled?
To turn of the WiFi add the WiFi library and use WiFi.forceSleepBegin();
Firmware is the program/sketch that controls a MicroController Unit aka MCU (and in this case a Arduino).
Best explanation I ...
- 1,356
5
votes
ESP8266 not connecting to WiFi
Maybe you have a space in your WIFI SSID so you should check this in your router. Also maybe your WIFI is on 5Ghz and the ESP can't see it because it is only for 2.4 Ghz. Also if your WIFI AP is on a ...
- 678
5
votes
ESP8266 print DNS address (obtained via DHCP)
Serial.println(WiFi.dnsIP());
If you have more than one DNS server you can specify the index:
Serial.println(WiFi.dnsIP(1));
- 105k
5
votes
Accepted
ESP32 open "captive portal" on connected
Thanks to @Majenko I was able to find what I was looking for on the internet from this link. When I googled "captive portal" instead of the phrases that I was using I found a lot more ...
- 938
5
votes
Accepted
Why does Arduino Nano 33 IoT always choose the weakest WiFi BSSID?
On Nano 33 IoT the WiFi network adapter is NINA esp32 module with Arduino's nina-fw. nina-fw is written with the use of ESP-IDF framework by the esp32 manufacturer Espressif.
To connect to an AP the ...
- 17.8k
4
votes
Accepted
FCC Certification
These products are not certified, they merely have been verified and issued a Declaration of Conformity. The WiFi module on the WiFi shield itself has been certified, as indicated by the FCC ID on its ...
- 1,099
4
votes
Accepted
Link Arduinos over 5 acre laser tag field
You can use nRF24L01+
The chips offer:
Really high range with power amplifier (1km open field radius (776 acres if I'm right) , but fairly high power consumption 100-150mA @ 3.3V)
High range with ...
- 624
Only top scored, non community-wiki answers of a minimum length are eligible