123 lines
9.0 KiB
Markdown
123 lines
9.0 KiB
Markdown
# ATMEGA328P_connectedMailBox
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## What is it ?
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This system is an ATMEGA328P and NRF24L01+ based low power device to detect when something is posted in my mail box. The electronic circuit shares the same designed as the low power weather station I made enabling it to consume only 60µA when sleeping.
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**You will also need to build a receiver station to receive the messages. For that you can build your own or use [this design](/git/Th3maz1ng/ESP8266_dual_NRF24l01_gateway) I made.**
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**Check the LICENSE.md file at the root of this project for more information.**
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## What is this device capable of ?
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The system is able to wait for up to three distinct events (interrupt sources). This means that it can detect up to three actions like :
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* A letter was delivered in the mail box using the small letter tray.
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* A package was delivered using the door.
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* The mail was picked up using the rear door by me or a family member.
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**Changing the design of the event detection circuit can easily increase the number of various events that could be detected**
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The schematic is available [here](/git/Th3maz1ng/ATMEGA328P_connectedMailBox/src/branch/master/schematic/ATMEGA328P_connectedMailBox.pdf).
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The device is fixed to the mailbox using two strong neodymium magnets. No need to make holes in the box.
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## Power consumption :
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* The device consumes around 60µA when sleeping (ie : waiting for an event to happen).
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* The device consumes around 13mA for a very short period of time when transmitting a RF packet after an event was detected.
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* The current design is using a 2000mAh LiPo battery which should last for at least four years of every day use. **/!\ I may update the design to add a solar pannel like I did for the weather station.**
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## Project folder architecture :
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``` json
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/
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|_src This folder contains all the C/C++ file sources.
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| \_app This folder contains the main app and it's dependencies.
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| |_libs This folder contains all the required 3rd party libraries that should be put in "Arduino\libraries" folder in order for the app to compile.
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|_schematic This folder contains all the files associated with the schematic.
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| \_KiCad This folder contains the KiCad files associated with the project.
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| |_ATMEGA328P_connectedMailBox.pdf The most recent schematic exported in pdf format for quick viewing.
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|_documentation This folder may one day contain the associated documentation if needed.
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|_.gitignore
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|_LICENSE.md
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|_README.md The content of this very page
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```
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## The hardware needed to build the system :
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Here is a list of the parts I used to build my connected mailbox system.
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You will find a link next to the parts name. **I do not have any partnerships with the sites linked bellow.**
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* [1 * Shielded NRF24L01+](https://fr.aliexpress.com/item/32976054389.html?spm=a2g0o.cart.0.0.657d3c00t37c7e&mp=1)
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* [1 * TC4056 (1 cell lipo charge/discharge protection)](https://fr.aliexpress.com/item/4000522397541.html?spm=a2g0o.productlist.0.0.175b30dfajsyO5&algo_pvid=203adaed-55ba-4678-a3e4-3aafcad89952&algo_exp_id=203adaed-55ba-4678-a3e4-3aafcad89952-1)
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* [ATMEGA328PU board (3.3V 8Mhz version)](https://fr.aliexpress.com/item/4000190780977.html?spm=a2g0o.store_pc_allProduct.8148356.4.66547f0dNb2qkV)
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* [1 * 3.3V LDO for the power rail : RT9013-33PB](https://fr.aliexpress.com/item/4001097171645.html?spm=a2g0o.productlist.0.0.48aa7800HoFD4h&algo_pvid=454c2fa4-a1a9-4ec2-9398-00d598a20b67&algo_exp_id=454c2fa4-a1a9-4ec2-9398-00d598a20b67-0)
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* [Small junction box 8cm * 8cm * 5cm](https://www.amazon.com/LeMotech-Dustproof-Waterproof-Electrical-85mmx85mmx50mm/dp/B075X14RVH/ref=sr_1_2?dchild=1&keywords=junction+box+3.4+3.4+2&qid=1626903891&sr=8-2)
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* [2 or 3 x reed switches **with 3 poles** ](https://fr.aliexpress.com/item/1005001688562983.html?spm=a2g0o.productlist.0.0.6af12fe2pOdrTe&algo_pvid=d8aa7000-49e2-490f-9772-b5938b8f802b&algo_exp_id=d8aa7000-49e2-490f-9772-b5938b8f802b-6&pdp_ext_f=%7B%22sku_id%22%3A%2212000017139802685%22%7D&pdp_npi=2%40dis%21EUR%213.11%212.31%21%21%211.06%21%21%402100bdd816646211591336834e93df%2112000017139802685%21sea&curPageLogUid=aKoLUKTtQsPD)
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* [1 * sliding ON/OFF switch](https://fr.aliexpress.com/item/4001207529493.html?spm=a2g0o.productlist.0.0.3a202c513vfjq1&algo_pvid=aa695a79-38ef-4ea6-8f05-faf59ce2ef72&algo_exp_id=aa695a79-38ef-4ea6-8f05-faf59ce2ef72-6&pdp_ext_f=%7B%22sku_id%22%3A%2210000015300780421%22%7D&pdp_npi=2%40dis%21EUR%210.74%210.74%21%21%211.29%21%21%402100bdd816646213639033134e93df%2110000015300780421%21sea&curPageLogUid=xfjhNRKUeMWX)
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* [4 * Plugs (male and female) : 1 for the battery + 3 for the reed switchies](https://fr.aliexpress.com/item/1005002144317363.html?spm=a2g0o.productlist.0.0.a83a45a3iDP0xc&algo_pvid=4b8bede6-01b6-40b3-a760-020cee19e8a8&algo_exp_id=4b8bede6-01b6-40b3-a760-020cee19e8a8-22&pdp_ext_f=%7B%22sku_id%22%3A%2212000018882135494%22%7D&pdp_npi=2%40dis%21EUR%211.75%211.75%21%21%21%21%21%402100bdd816646215869637519e93df%2112000018882135494%21sea&curPageLogUid=FI71z2caB3CG)
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* [1 * 18650 LiPo cell](https://fr.aliexpress.com/item/32982963185.html?spm=a2g0o.productlist.0.0.239b75c73qTXUy&algo_pvid=cb89721b-6859-4b79-82d1-f9d160d9cc9b&algo_exp_id=cb89721b-6859-4b79-82d1-f9d160d9cc9b-7&pdp_ext_f=%7B%22sku_id%22%3A%2266720423635%22%7D&pdp_npi=2%40dis%21EUR%217.37%215.9%21%21%21%21%21%402100bdde16646338349172264e0dd5%2166720423635%21sea&curPageLogUid=OUCa2kvr6oVj)
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* [1 * 18650 LiPo holder](https://fr.aliexpress.com/item/1005002481983856.html?spm=a2g0o.productlist.0.0.f5f763cbNLBu0K&algo_pvid=89526e49-cad2-4410-a877-e1667f90a59b&algo_exp_id=89526e49-cad2-4410-a877-e1667f90a59b-0&pdp_ext_f=%7B%22sku_id%22%3A%2212000020810965165%22%7D&pdp_npi=2%40dis%21EUR%212.17%211.47%21%21%210.71%21%21%402100bdde16646339350095156e0dd5%2112000020810965165%21sea&curPageLogUid=whHjK2QVuxQk)
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* [2 * Neodymium magnets](https://fr.aliexpress.com/item/1005003456990972.html?spm=a2g0o.productlist.0.0.26814f76NZKzoT&ad_pvid=2022100107212914868010394701920022856461_5&s=p)
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* 1 * IRLML6402 P-channel MOSFET
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* 1 * IRLML2502 N-channel MOSFET
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* 3 * 10K resistor
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* 1 * 1K resistor
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* 1 * 3.9K resistor
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* 1 * 3.2K resistor
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* 1 * 5K resistor
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* 1 * 15K resistor
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* 1 * 20K resistor
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* 1 * 8.2K resistor
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## Getting started :
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1. Clone this repository : git clone http://web-directories.cf/git/Th3maz1ng/ATMEGA328P_connectedMailBox.git
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2. Go to **"src\libs"** folder of this project and copy and paste its content in your "Arduino\libraries" folder.
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3. Open the app.ino file with the Arduino IDE and select the "Arduino Pro or Pro Mini" board with processor : (Atmega 3.3V 8Mhz).
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4. Compile and Upload !
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5. To receive the data sent by the device, you can check this other [project](/git/Th3maz1ng/ESP8266_dual_NRF24l01_gateway) which is the receiver end.
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## Configuration options :
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You may change some settings present in the ***definition.h*** file located in the "src/app" folder.
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Set **MAX_SEND_ROUND_RETRIES** to the number of send retries the device will perform if no ACK is received.
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Default is 5, increase this parameter if the RF link between the device and the receiving station is bad.
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This may increase power consumption, but it's better to receive the message than to save power.
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Set **SERIAL_DEBUG_ENABLED** to **1** to get debug output on the serial console.
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Set **SERIAL_BAUD_RATE** to the desired baudrate for debugging.
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Set **ADC_QUANTUM** to adjust the quantum if your VREF is not the same as mine.<br />
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To do so, measure which voltage does the VCC pin of your Arduino board output and divide it by 1024 (10 bit ADC resolution).
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Set **VOLTAGE_DIV_COEFF** to something different if you changed the voltage divider resistor values.
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Set **RADIO_CHANNEL** to the NRF's RF channel (between 0 and 125). **Do not forget to set the receiver station up on the same channel**
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Set **RADIO_NODE_ADDRESS** to change it's 5 byte address if you feel like it. **Do not forget to set the receiver station up on the same address**
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Set **RADIO_PA_LEVEL** to adjust the transmit power level if needed (higher the power, higher the current consumption)
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Set **ENABLE_LNA** to true or false to enable or disable the Low Noise Amplifier on the NRF modules if it has one.
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***If you have any questions, do not hesitate to contact me at : bugreport[at]laposte[dot]net***
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## Finally here are some pictures of the PCB, reed switches setup and mailbox :
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### Overall device:
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### Junction box layout closeup:
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### PCB back :
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### PCB front :
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### Reed switch installation in the mailbox :
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### Package door lock reed switch closeup:
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### Letter tray reed switch closeup:
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