Difference between revisions of "Elle0"
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* 2 Analog inputs for system battery voltage and current measurement | * 2 Analog inputs for system battery voltage and current measurement | ||
* CAN TX and RX lines are accessible | * CAN TX and RX lines are accessible | ||
<p style="color: red; font-size: 120%">Warning! The battery voltage measurement pin on the Elle0 does not have a built in voltage divider! DO NOT CONNECT 12V to it!!! You need an external voltage divider depending on the type of battery you use. Please refer to the [[Elle0#Battery Monitoring | Battery Monitoring]] section for details!</p> | |||
<gallery widths=200px heights=200px> | <gallery widths=200px heights=200px> | ||
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= Mechanical drawings = | = Mechanical drawings = | ||
[[Image:Elle0-top-mechanical.png|900px]] | [[Image:Elle0-top-mechanical.png|900px]] | ||
= Battery Monitoring = | |||
<p style="color: red; font-size: 120%">Warning! The battery voltage measurement pin on the Elle0 does not have a built in voltage divider! DO NOT CONNECT 12V to it!!! You need an external voltage divider depending on the type of battery you use.</p> | |||
The Elle0 does not provide a built in voltage divider for improved flexibility. Other autopilots like the Lisa/M come with a 10k Ohm - 2.2k Ohm voltage divider that is good for the use with 3s batteries. This setup does not have good resolution for smaller batteries and can not be used with larger batteries. | |||
In the default value that an Elle0 airframe file will assume is the before mentioned 10k Ohm - 2.2k Ohm voltage divider. To recreate it you connect one side of the 10k Ohm resistor to the battery, the other side of the resistor is connected to the 2.2k Ohm resistor and the voltage measurement pin of the Elle0. The remaining end of the 2.2k Ohm resistor is connected to ground. You can easily modify your uBEC to include the additional voltage divider. To build it by hand you can use industry standard 1/4w through hole resistors. | |||
If you want to measure a smaller battery with greater resolution you will have to adjust the resistor values to have a resulting voltage at the mid junction of not more than 3.3V. The nominal voltage of a fully charged LiPo cell is 4.2V. Also you will have to adjust the multiplication factor in your airframe file. | |||
= Schematic = | = Schematic = | ||
Revision as of 14:22, 28 February 2016
Elle0 is a low cost STM32F4 based autopilot. It was developed by 1BitSquared specifically to work with the Paparazzi UAV framework.
Features
- STM32F4 168MHz ARM Cortex-M4 microcontroller with FPU
- 1 Mbyte of Flash memory
- 192+4 Kbytes of SRAM including 64-Kbyte of CCM (core coupled memory) data RAM
- Cryptographic acceleration: hardware acceleration for AES 128, 192, 256, Triple DES, HASH (MD5, SHA-1), and HMAC
- True random number generator
- 3 axis gyroscope (connected over SPI for high speed sampling and low latency)
- 3 axis accelerometer (connected over SPI for high speed sampling and low latency)
- 3 axis magnetometer (connected over SPI for high speed sampling and low latency)
- barometer (connected over dedicated SPI for low noise operation and low latency)
- 1 I2C auxilary sensor connection
- 2 TTL level serial ports for telemetry radio and GPS
- 2 serial input interfaces for remote control receivers (using Spektrum compatible JST connectors)
- 1 USB port for easy firmware upgrade
- 8 PWM outputs/inputs for servos or legacy PPM RC receivers
- 2 Analog inputs for system battery voltage and current measurement
- CAN TX and RX lines are accessible
Warning! The battery voltage measurement pin on the Elle0 does not have a built in voltage divider! DO NOT CONNECT 12V to it!!! You need an external voltage divider depending on the type of battery you use. Please refer to the Battery Monitoring section for details!
Elle0 V1.2 top view
Elle0 V1.2 bottom view
Pinout
Mechanical drawings
Battery Monitoring
Warning! The battery voltage measurement pin on the Elle0 does not have a built in voltage divider! DO NOT CONNECT 12V to it!!! You need an external voltage divider depending on the type of battery you use.
The Elle0 does not provide a built in voltage divider for improved flexibility. Other autopilots like the Lisa/M come with a 10k Ohm - 2.2k Ohm voltage divider that is good for the use with 3s batteries. This setup does not have good resolution for smaller batteries and can not be used with larger batteries.
In the default value that an Elle0 airframe file will assume is the before mentioned 10k Ohm - 2.2k Ohm voltage divider. To recreate it you connect one side of the 10k Ohm resistor to the battery, the other side of the resistor is connected to the 2.2k Ohm resistor and the voltage measurement pin of the Elle0. The remaining end of the 2.2k Ohm resistor is connected to ground. You can easily modify your uBEC to include the additional voltage divider. To build it by hand you can use industry standard 1/4w through hole resistors.
If you want to measure a smaller battery with greater resolution you will have to adjust the resistor values to have a resulting voltage at the mid junction of not more than 3.3V. The nominal voltage of a fully charged LiPo cell is 4.2V. Also you will have to adjust the multiplication factor in your airframe file.
Schematic
System set up examples
Where to Buy
Elle0 is available for Pre-Order at the 1BitSquared store. It will be available early 2016.