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92 lines
4.5 KiB
Plaintext
92 lines
4.5 KiB
Plaintext
---
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id: peripherals
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title: Heltec ESP32 V3 Supported Peripherals
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sidebar_label: Peripherals
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sidebar_position: 3
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---
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import Tabs from "@theme/Tabs";
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import TabItem from "@theme/TabItem";
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<Tabs
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groupId="heltecESP32V3"
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queryString="heltecESP32V3"
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defaultValue="GPS"
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values={[
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{label: 'GPS Module', value: 'GPS'},
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{label: 'Keyboard', value: 'Keyboard'},
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{label: 'Buzzer', value: 'Buzzer'},
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]}>
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<TabItem value="GPS">
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## GPS Module
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### Introduction
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This informational guide outlines the process of enhancing the Heltec ESP32 V3 board by integrating the GT-U7 GPS Module. The addition of this module provides precise GPS capabilities and a real-time clock (RTC), eliminating the need for WiFi or a smartphone for time tracking. This enhancement is particularly beneficial for the mesh, where tracking the duration since the last seen device is crucial.
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However, it's important to note that the GPS module increases the power demand of your node. We'll address this by detailing how to incorporate a switch or an NPN 2N2222 transistor into your setup. This enables firmware-controlled power management, conserving battery life without sacrificing functionality.
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It is important to note that the GPS module increases the power demand of the node. This guide details the incorporation of a switch or an NPN 2N2222 transistor to enable firmware-controlled power management, conserving battery life without compromising functionality.
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### Benefits
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- **GPS Capabilities**: Provides the node with the ability to determine its location with high precision, which is invaluable for tracking, mapping, and various other applications requiring location data.
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- **Real-Time Clock (RTC)**: Ensures accurate timekeeping on the mesh network without relying on external time sources such as the internet or a connected smartphone.
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### Power Consumption Considerations
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The GT-U7 module is known for its high power consumption, which can potentially shorten the battery lifespan of the node. To mitigate this, two approaches are recommended:
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- **Manual Switch**: A simple on/off switch for the GPS module, allowing for manual power management.
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- **NPN 2N2222 Transistor**: Facilitates automatic power control through the firmware, enabling the device to turn off the GPS module based on specific conditions or after a set period.
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### Materials Needed
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- Heltec ESP32 V3 board
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- GT-U7 GPS Module
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- NPN 2N2222 Transistor
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- Wires and soldering equipment
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- (Optional) Switch for manual power control
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### Instructions
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1. Solder a cable from the TXD slot on the GPS module to GPIO 48 on Heltec board. (You may choose your own GPIO pin)
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2. Solder a cable from the RXD slot on the GPS module to GPIO 47 on Heltec board. (You may choose your own GPIO pin)
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3. Solder a cable from the GND slot on the GPS module to GND pin on Heltec board.
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4. Solder a cable from left leg of NPN 2N2222 Transistor to VCC skit on GPS module.
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5. Solder a cable from Right leg of NPN 2N2222 Transistor to 3V/5V pin on Heltec board.
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6. Solder a cable from Middle leg of NPN 2N2222 Transistor to GPIO 48 of Heltec board. (You may choose your own GPIO pin)
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7. Go to Meshtastic app > Radio Configurations > Position
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8. Set GPS_RX_PIN to 48 (This will communicate to the TXD slot on the GPS)
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9. Set GPS_TX_PIN to 47 (This will communicate to the RXD slot on the GPS)
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10. Set PIN_GPS_EN to 46 (This will allow the meshtastic firmware to turn off the power on the GPS board with the user button of the Heltec Board by pressing it 3 times)
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### Wiring Diagram
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### Troubleshooting Tips
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If the GPS module does not power on, check the connections to the transistor and ensure that the middle pin is properly configured in the firmware settings.
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If the message "GPS is Disabled" appears, press the user button on the Heltec board three times to enable it.
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If the message "No GPS Present" appears, check that the TXD and RXD are correctly configured.
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If the message "No GPS Lock" appears, move the node to another location with access to the sky for a bit to lock on properly.
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If the location is not accurate, walk around to allow the GPS to properly lock on.
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### Conclusion
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By following this guide, you can enhance your Heltec ESP32 V3 board with valuable GPS capabilities and an RTC, while effectively managing power consumption. Whether for a hobby project or a more serious application, these additions significantly expand the potential of your device.
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</TabItem>
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<TabItem value="Keyboard">
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## Keyboard
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Coming Soon
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</TabItem>
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<TabItem value="Buzzer">
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## Buzzer
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Coming Soon
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</TabItem>
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</Tabs>
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