Steps for programming the Blake Atmega via Programmer (When OTA is not working)
Please note that these steps are to be followed when the OTA (Over-The-Air) update is not working or when the device needs to be programmed manually.
The update process involves two main stages:
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Burning the Bootloader – to correctly set the fuse bits on the microcontroller.
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Uploading the Firmware – to flash the latest firmware version on the device.
Important:
Both steps are essential. Skipping the bootloader step may cause the device to malfunction since the fuse bits may not be configured properly.
1. Burning the Bootloader
Hardware Required:
-
USBasp programmer
-
Bolt IoT device PCB
Connections between USBasp and Bolt IoT PCB:
| USBasp Pin | Bolt PCB Pin |
|---|---|
| 1 | MISO |
| 2 | VCC |
| 3 | SCK |
| 4 | MOSI |
| 5 | RESET |
| 6 | GND |
Procedure:
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Connect the USBasp programmer to the Bolt IoT PCB as per the pin mapping above (Image Attached).
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Open Arduino IDE on your system.
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Navigate to Tools → Board and select Arduino UNO.
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Under Tools → Programmer, select USBasp.
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Click on “Burn Bootloader” to set the fuse bits correctly.
Once this step is complete, the bootloader will be successfully burned into the device.
2. Uploading the Firmware
Procedure:
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Disconnect and reconnect the USBasp connected to the Bolt IoT PCB (same as above).
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Open Command Prompt in Windows.
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Enter the following command after editing the paths as per your setup:
"PATH_TO_AVRDUDE_FILE/avrdude" "-C PATH_TO_AVRDUDE_CONF_FILE/avrdude.conf" -v -patmega328p -cusbasp -Pusb "-Uflash:w:PATH_TO_FIRMWARE_FILE\FIRMWARE_FILENAME:i" -
Make sure the firmware file you are uploading is with bootloader.
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Press Enter to execute the command.
When the upload completes successfully:
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You will see a “SUCCESS” message in the terminal.
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The buzzer on the Bolt IoT device will beep momentarily to indicate that the firmware has been updated successfully.