How To Repair An Electronic Flashlight Replacement Module For Kodak Az521 Camera
We have worked with the ESP32 module already, information technology'due south a powerful yet inexpensive microcontroller from Espressif and A-Thinker with advanced features like Bluetooth, WiFi, and multipurpose GPIO ports.
Today we'll look at another fellow member of the ESP32 module family, the ESP32-CAM lath.
This amazing little module packs a lot of power and features into a small package. Read on and see how you tin put it to utilize.
Introduction
The ESP32-CAM is a full-featured microcontroller that also has an integrated video camera and microSD bill of fare socket. It's inexpensive and easy to use, and is perfect for IoT devices requiring a camera with advanced functions like image tracking and recognition.
The sample software distributed by Espressif includes a sketch that allows you to build a web-based camera with a sophisticated control panel. Later you get the hang of programming the device you'll discover that it is very like shooting fish in a barrel to utilize.
Not bad for a board that costs about 10 dollars, including the camera!
Examining the ESP32-CAM
The ESP32-CAM module has fewer I/O pins than the previous ESP-32 module we looked at. Many of the GPIO pins are used internally for the camera and the microSD carte port.
Another thing missing from the ESP32-CAM module is a USB port. In order to programme this device you'll need to brand utilize of an FTDI adapter. This will be described further on in this commodity.
Hither is the pinout of the ESP32-CAM Module:
One matter to note about this module is that information technology has components on both sides of the printed circuit board. The "top" of the board has the connector for the photographic camera module, likewise as the microSD (sometimes chosen "TF") carte socket.
You'll also annotation a foursquare white LED on the top of the module, this can deed as a "wink" for illuminating the field of study yous are trying to view with the camera.
The underside of the circuit board has the ESP32-Due south module. It also has a connector for an external antenna, too as an internal antenna that is etched onto the circuit board. I'll explain how to use the external antenna before long.
Another cardinal component located underneath the board is the reset switch.
Considering there are and then many components on the bottom of the module you lot may find it easier not to utilise a solderless breadboard when experimenting with the ESP32-CAM module. The use of jumpers with female person Dupont connectors is recommended.
ESP32-CAM Specifications
The ESP32-CAM is based upon the ESP32-South module, so it shares the same specifications. It has the post-obit features:
- 802.11b/g/n Wi-Fi
- Bluetooth 4.ii with BLE
- UART, SPI, I2C and PWM interfaces
- Clock speed up to 160 MHz
- Computing ability up to 600 DMIPS
- 520 KB SRAM plus 4 MB PSRAM
- Supports WiFi Epitome Upload
- Multiple Slumber modes
- Firmware Over the Air (FOTA) upgrades possible
- 9 GPIO ports
- Built-in Wink LED
Camera Specifications
The ESP32-CAM includes an OV2640 camera module. The device too supports OV7670 cameras. The OV2640 has the post-obit specifications:
- 2 Megapixel sensor
- Array size UXGA 1622×1200
- Output formats include YUV422, YUV420, RGB565, RGB555 and 8-bit compressed data
- Prototype transfer rate of 15 to 60 fps
Working with the ESP32-Cam
Using the ESP32-CAM is like to using the ESP32 modules we looked at previously, with 1 major divergence. The ESP32-CAM board has no USB port, so you can't just connect it up to your computer and starting time loading programs.
Instead you lot will demand to add an external FTDI adapter. This is the aforementioned adapter you would use programming an Arduino Pro Mini, so if y'all've worked with the Pro Mini and so you lot probably already have 1 of these.
Hooking up the FTDI Adapter
Hither is the hookup diagram for connecting the FTDI adapter to the ESP32-CAM module:
It is of import to note that the FTDI adapter must be set for a three.three-volt VCC output, not 5-volts, every bit we are powering the ESP32-CAM using the 3.iii-volt power pin. You could likewise keep the FTDI adapter at five-volts and use the 5-volt power pin instead.
I accept found the iii.3-volt set to exist more reliable, which is why I am recommending it.
Yous'll also need to notation that there is a connection betwixt the GPIO 0 pin and Ground. This connection is only required while you are programming the ESP32-CAM. Once yous have finished programming the module you lot can ability it down and remove this connection.
As you'll require admission to the Reset push button push you may want to use female person-to-female person Dupont jumpers, instead of a solderless breadboard, when working with the ESP32-CAM.
Programming with the Arduino IDE
In social club to use the ESP32-CAM, or any ESP32, with the Arduino IDE you will need to use the Board Manager to add the ESP32 boards. This is accomplished past adding a JSON file link to your Arduino IDE Preferences "Additional Boards URL" text box.
Complete details for doing this can be found in the Getting Started with ESP32 commodity.
One time you have done this you will observe a list of ESP32 boards in your Arduino IDE Boards Manager. Select the A-Thinker ESP32-CAM board from this list.
Loading the Sample Sketch
Subsequently you select the A-Thinker ESP32-CAM board you will have a number of instance sketches loaded into your Arduino IDE.
The sample sketch we will be using is the CameraWebServer sketch. You tin can load it as follows:
- Open up the Arduino IDE
- Click on the File menu item on the top menu bar.
- Scroll downwards and click on Examples . A sub-menu will open.
- Gyre down the sub-menu and look for Examples for A-Thinker ESP32-CAM .
- Below this you'll see an entry for ESP32 . Click on it and another sub-menu will open.
- Select Photographic camera from this sub-menu.
- Select CameraWebServer
The CameraWebServer sketch is very complicated and consists of 4 files, so I won't go over the details here.
The sketch turns the ESPO32-CAM into a full-featured online camera, complete with face detection capabilities and a wealth of controls. It's a very impressive demonstration of the ESP32-CAMs capabilities!
Earlier you can employ the sketch you lot volition need to modify it for your network, and to select the right ESP32 module.
- Nether the lines proverb Select Photographic camera Model you need to select the correct entry for your board. The 1 I used (and the almost popular one) is CAMERA_MODEL_AI_THINKER
- Below that yous will see a line for your SSID. Enter your networks SSID hither.
- On the line below the SSID enter your network access password.
Annotation that the ESP32-CAM but works with 2.iv GHz WiFi networks.
Relieve the sketch after yous modify it.
Testing the ESP32-CAM
Load the sketch into your IDE and printing the Upload button to compile and load it to the ESP32-CAM, via the FTDI connector. Exist sure you have the jumper continued betwixt GPIO 0 and Ground.
The sketch may take a while to compile, this is normal. When it is finished you can disconnect the USB cable, remove the jumper wire, and then reconnect the USB cable to power the board back up once again.
Open your Serial Monitor, making sure information technology is set to a baud rate of 115,200 bps. Then press the Reset switch on the ESP32-CAM module.
You should run across some initialization information, followed by a argument maxim that the board has connected to the network and has obtained an IP address. The IP address will exist in the course of a URL, such equally http://192.168.1.67 (this is just an instance URL, yours will be different)
Re-create this address and so paste it into the address bar of a web browser. The spider web browser needs to exist on the aforementioned network equally the ESP32-CAM is connected to.
You lot should now meet the webpage for the camera, complete with a number of controls.
Click on the Start Stream button to stream video. You can change the size and frame rate of the video using the driblet-down at the top of the screen.
Experiment with the many features of the Camera Spider web Server, and try to recall that this is all coming from a x-dollar module!
Resolving ESP32-CAM Ability Issues
If you have problems getting the ESP32-CAM to piece of work the showtime thing yous'll want to investigate is the power supply. This is also truthful with other ESP32 modules.
Although the ESP32 can operate at a very low standby current information technology also consumes big bursts of current when operating its radio, and this can affect both WiFi and Bluetooth functioning.
I way to decide if you have a power result is to observe the Serial Monitor when starting your ESP32-CAM. If yous meet a message proverb a "Brownout Condition" has been detected so information technology's likely that the ESP32-CAM is trying to draw more current than you're able to supply for it.
There are a few ways to go around this issue.
Using an Agile USB Hub
The FTDI module that supplies power and communications for the ESP32-CAM gets its power from the USB cable connected to it. The power source here is your reckoner.
Nigh USB2 computer ports do have enough current capability to satisfy the requirements of the ESP32-CAM, but some practice not.
Some other gene can be the length and quality of the USB cable. These cables use very thin wire, and sometimes the voltage drop is pretty significant. Often you can resolve the brownout effect by simply replacing the cablevision.
Another mode, and ane that worked for me in the workshop, is to use a powered USB hub. This allows you to identify the hub close to the ESP32-CAM and employ a shorter USB cable to drive the FTDI adapter.
A USB2 hub is sufficient, information technology doesn't need to be USB3. The hub allows the communications signals to pass through to the FTDI adapter while powering it from its own power supply.
It is important to apply a POWERED hub hither, every bit using a passive USB hub only defeats the purpose and would probably make things worse!
Using a 5-volt Power Supply
Another way to resolve the brownout condition is to power the ESP32-CAM with the 5-volt power pivot, instead of the three.3-volt pin.
If you are using the FTDI adapter and are having issues running the ESP32-CAM endeavor switching the power to v-volts and using the 5-volt power pin.
Oddly enough I found that the ESP32-CAM seems to RUN meliorate with 5-volts, just it is easier to Programme using iii.3-volts! This might be unique to my setup, however, so I urge you to experiment.
The above image shows an ESP32-CAM on a solderless breadboard with a 5-volt breadboard power supply. The ESP32-CAM was already programmed using female-to-female jumper cables and 3.three-volts.
The breadboard power supply is powered by a standard ix-volt battery, allowing for a portable setup.
One upshot with mounting the module on a breadboard is it prevents easy access to the reset switch, yet, you tin admission the switch from the forepart using a toothpick or other insulated object.
Using an External Antenna
Another problem y'all might see using the ESP32-CAM is WiFi Signal forcefulness.
The ESP32-CAM has an antenna etched on its printed circuit board. The specification canvas from A-Thinker claims a gain of 2.1dBi for the onboard antenna.
If yous are in close proximity to your router or WiFi access point this should be sufficient, even so as you move the module further from the signal source you can experience dropouts or loss of betoken.
The solution for this is to add an external antenna.
Selecting an External Antenna
In that location are many different external antennas that would exist suitable for use with the ESP32-CAM. The requirements for the external antenna are as follows:
- It needs to piece of work in the 2.4GHz ring.
- It needs to have a U.FL or IPEX MHF or MHF1 connector.
Otherwise you can use either a flexible "stick-on" or a dipole antenna.
Using the antenna is not but simply a matter of plugging information technology into the socket all the same. Y'all will need to make a modification to the ESP32-CAM lath, and this will require a bit of soldering. So heat up your soldering iron and follow these instructions.
Modifying the ESP32-CAM for External Antenna
The ESP32 board has a small antenna connection on the bottom of the module, very shut to the born antenna.
Next to the antenna connector, and betwixt the built-in antenna and the metal case of the ESP32S module, are a trio of solder pads. There is a 0-ohm (yes, you read that correctly) resistor across two of the pads, as illustrated here:
In the in a higher place diagram y'all tin see the position of this resistor when using the internal antenna.
To use the external antenna you demand to remove the resistor and identify information technology in the gap between the bottom pads, as illustrated here:
The surface-mount resistor can be difficult to work with, especially if y'all are unaccustomed to working with SMD components. Just equally this is a 0-ohm resistor you lot can but apply a small piece of wire instead, in fact that'due south what I did and it worked fine.
Annotation that you can't put a wire in that location and keep the original resistor, y'all tin merely use one antenna at a time.
Later on you accept modified the board y'all tin install the external antenna.
Antenna Examination Sketch
Hither is a simple sketch that you tin can apply to test the antenna functioning, yous can use it with both the internal or external antenna.
1 ii three 4 5 6 7 8 9 10 eleven 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 | /* ESP32 WiFi Signal Test esp32-wifi-signal-test.ino Tests WiFi point strength *Requires WiFi SSID and Countersign DroneBot Workshop 2020 https://dronebotworkshop.com */ // Include WiFi library #include "WiFi.h" // SSID and Password - alter for your WiFi network const char* ssid = "REPLACE_WITH_YOUR_SSID" ; const char* password = "REPLACE_WITH_YOUR_PASSWORD" ; void setup ( ) { // Setup serial monitor Serial . begin ( 115200 ) ; // Start WiFi and conect to network WiFi . begin ( ssid , countersign ) ; // Wait while connexion established while ( WiFi . status ( ) != WL_CONNECTED ) { delay ( 500 ) ; Series . impress ( "-" ) ; } // WiFi is connected Serial . println ( "" ) ; Serial . print ( "Connected to network " ) ; Serial . println ( ssid ) ; delay ( 100 ) ; } void loop ( ) { Serial . print ( ssid ) ; Serial . print ( " Signal Level: " ) ; Series . println ( WiFi . RSSI ( ) ) ; delay ( 2000 ) ; } |
This is a very bones sketch and most of its functionality comes from the WiFi Library that Espressif installs with the ESP32 board director.
You'll need to modify this sketch with your SSID and WiFi countersign, just as you did for the CameraWebServer example sketch. These values are assigned to a couple of constants.
In the Setup the serial monitor is initialized and and then an endeavour is fabricated to connect to the WiFi access point using the credentials you supplied.
Assuming y'all go a successful connection we move on to the Loop.
In the Loop we just use the WiFi library to read the signal forcefulness and nosotros so display this on the serial monitor. After a ii-second delay nosotros do information technology all again.
Load the sketch, recall to strap the GPIO 0 pin to ground while you are uploading the lawmaking. After that you lot tin can remove the jumper and hitting the reset key.
Y'all should find the signal strength on your serial monitor.
In my case I found a substantial difference betwixt the internal antenna and the external one. I was getting readings of about -60dBm with the internal antenna, and -48dBM or ameliorate with the external one, a major improvement.
Keep this sketch handy for testing out your other ESP32 installations.
Determination
The ESP32-CAM module is an amazing value. At less than ten dollars you go a full-featured microcontroller that includes both a video camera and a microSD carte du jour socket.
The supplied example sketch may be all that you need in order to create a useful product with this device. Of class y'all can have it much further and create sketches to use this versatile module in a number of IoT projects.
I hope you enjoyed this article and that it inspires you to create your own photographic camera-enabled devices. And if you run into bug with it there is an ESP32-ESP8266 section on the DroneBot Workshop Forums where you can discuss this with other enthusiasts like yourself.
Summary
Commodity Name
Getting started with the ESP32-CAM
Description
The ESP32-CAM is an cheap microcontroller that comes with a built-in photographic camera and microSD card interface - all for less than ten dollars! In this commodity, I'll show y'all how to get started with the ESP32-CAM and use information technology to create a Camera Spider web Server. We'll also go over some troubleshooting tips you can use if y'all have bug getting your ESP32-CAM to work.
Author
DroneBot Workshop
Publisher Name
DroneBot Workshop
Publisher Logo
Source: https://dronebotworkshop.com/esp32-cam-intro/
Posted by: godinthemot.blogspot.com
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