
SunTracker_BLE
Dependencies: BLE_API X_NUCLEO_6180XA1 X_NUCLEO_IDB0XA1 X_NUCLEO_IHM01A1 X_NUCLEO_IKS01A1 mbed
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Overview
The SunTracker is a demo application running on ST Nucleo-F401RE stacking a set of ST X-NUCLEO expansion boards.
Main features provided are:
- A solar panel follows the light source, orienting the panel in order to achieve the best panel efficiency.
- Orientation is controlled thanks to a couple of VL6180X FlightSense light sensors mounted on a X-NUCLEO-6180XA1 expansion board and driven by X-NUCLEO-IHM01A1 controlled stepper motor acting as actuator to orientate the panel.
- The system features a progressive control on the stepper motor in order to modulate the panel rotation speed according to the light angle.
- The application is also able to control the panel productivity reading the panel voltage through an ADC and proving feedback on the local display.
- A manual orientation is possible by using the accelerometer on a X-NUCLEO-IKS01A1 expansion board that, according on board tilt, controls the speed and the rotate direction.
- A remote control is available using a X-NUCLEO-IDB04A1 or a X-NUCLEO-IDB05A1 Bluetooth Low Energy expansion board. Remote control software is here.
Working Status
- SunTracker has 3 working status visible on FlightSense display and switchable by pressing the User Button:
Status 0 (Idle)
- Motor: Free Turning
- Display: Waiting for User Button
Status 1
- Motor: Driven by Light
- Display: Direction and Light Intensity = Direction and Motor Speed
Status 2
- Motor: Driven by Light
- Display: Solar Panel Efficiency
Status 3
- Motor: Driven by Accelerometer
- Display: Direction and Accelerometer Intensity
Server Startup
- When you plug the power supply, the word ‘PUSH’ is shown on display.
- You can manually rotate the structure to assign the ‘Zero Point’. Then press the User Button to launch the application.
- The display will show this status, which means that the structureis oriented to maximize the efficiency of the solar panel.
- If there is a light displacement, the structure will rotate, left or right,to follow the light source and on display is shown the direction and the speed.
- You can press the User Button to show the panel efficiencywith 4 digits that represent the range from 0v (0000) to 3,3v (3300).
- Further pressing the User Button you will manual rotate the panel by tilt the Server or Client accelerometer depending by BLE connection.
Client Startup
- The Client application can remotely control the User Button and the Accelerometer functions.
- Power on the Client AFTER the Server, it will automatically search for the SunTracker and will establish a BLE connection.
- The Green Led on Nucleo Client board will be powered on.
Rotation Features
- It has been implemented a block of rotation to avoid cables twist.
- The blocking point can be set in the firmware by changing a constant.
- You can manually rotate the structure to assign the ‘Zero Point’ before press the User Button to launch the application.
- The system features a progressive control on the stepper motor in order to modulate the rotation speed according to the light or accelerometer angle.
List of Components
SERVER SunTracker_BLE
- Nucleo-F401RE platform using a STM32F401RET6 microcontroller.
- X-NUCLEO-IHM01A1 - Stepper motor driver board based on the EasySPIN L6474.
- X-NUCLEO-6180XA1 - 3-in-1 proximity and ambient light sensor board based on ST FlightSense technology.
- VL6180X-SATEL - Satellite boards compatible with X-NUCLEO-6180XA1 board.
- X-NUCLEO-IKS01A1 - Motion MEMS and environmental sensor board.
- X-NUCLEO-IDB04A1 or X-NUCLEO-IDB05A1 - Bluetooth Low Energy Bluetooth low energy evaluation board.
- Stepper Motor 400’’ (Part Number 5350401) - To orientate the Mechanical Structure.
- Solar Panel 0.446w (Part Number 0194127) - To capture sunlight and generate electrical current.
- Power Supply 12v (Part Number 7262993) - To provide power supply at the Stepper Motor.
- Flat Cable 6 ways (Part Number 1807010) - To plug VL6180X-SATEL with X-NUCLEO-6180XA1 (60cm length each x2).
- Cable Connector (Part Number 6737694) - To plug the Flat Cable (x4).
- Power Connector (Part Number 0487842) - To provide Power Supply to X-NUCLEO-IHM01A1.
CLIENT SunTracker_BLE_Remote
- Nucleo-F401RE platform using a STM32F401RET6 microcontroller.
- X-NUCLEO-IKS01A1 - Motion MEMS and environmental sensor board.
- X-NUCLEO-IDB04A1 or X-NUCLEO-IDB05A1- Bluetooth Low Energy Bluetooth low energy evaluation board.
MECHANICAL STRUCTURE
Find here the STL files to print with a 3D printer.
FLAT CABLE ASSEMBLY
HARDWARE SETUP
Nucleo ADC + Solar Panel
Connect Solar Panel cables to Nucleo Morpho PC_3 (white) and Nucleo Morpho GND (black). Connect a capacitor 10uF between PC_3 and GND to stabilize its voltage value shown on display.
EasySpin (L6474) + BLE
Hardware conflict between EasySpin DIR1 and BLE Reset, both on same Arduino Pin PA_8. Disconnect PA_8 between EasySpin and Nucleo by fold EasySpin Pin. PB_2 has been configured as EasySpin DIR1 in the firmware .Connect Nucleo Morpho PB_2 to FlightSense Arduino PA_8 by a wire.
FlightSense Satellites
In case of instability with I2C due to long flat cables, solder 4 SMD capacitors 47pF on FlightSense board in parallel between R15, R16, R17, R18 and plug 2 capacitors 15pF between FlightSense Arduino PB_8 and PB_9 to GND pin to cut-off noises over 720 KHz.
Arduino & Morpho Pinout
Revision 0:becf0d313663, committed 2015-12-03
- Comitter:
- fabiombed
- Date:
- Thu Dec 03 12:17:33 2015 +0000
- Child:
- 1:8f312c1686b6
- Commit message:
- Added MEMS Manual Control
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/X_NUCLEO_6180XA1.lib Thu Dec 03 12:17:33 2015 +0000 @@ -0,0 +1,1 @@ +http://developer.mbed.org/teams/ST-Expansion-SW-Team/code/X_NUCLEO_6180XA1/#18abb7f7dcb2
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/X_NUCLEO_IHM01A1.lib Thu Dec 03 12:17:33 2015 +0000 @@ -0,0 +1,1 @@ +https://developer.mbed.org/teams/ST-Expansion-SW-Team/code/X_NUCLEO_IHM01A1/#ba2728afe4c2
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/X_NUCLEO_IKS01A1.lib Thu Dec 03 12:17:33 2015 +0000 @@ -0,0 +1,1 @@ +http://developer.mbed.org/teams/ST/code/X_NUCLEO_IKS01A1/#a91987e8cf51
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/main.cpp Thu Dec 03 12:17:33 2015 +0000 @@ -0,0 +1,151 @@ +/** + ****************************************************************************** + * @file main.cpp + * @author Davide Aliprandi, STMicrolectronics + * @version V1.0.0 + * @date October 16th, 2015 + * @brief mbed vertical application using the STMicrolectronics + * X-NUCLEO-IHM01A1 Motor Control Expansion Board and the + * X-NUCLEO-IKS01A1 MEMS Inertial & Environmental Sensors Expansion + * Board to get a MEMS-based motor control (direction and speed). + ****************************************************************************** + * @attention + * + * <h2><center>© COPYRIGHT(c) 2015 STMicroelectronics</center></h2> + * + * Redistribution and use in source and binary forms, with or without modification, + * are permitted provided that the following conditions are met: + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * 3. Neither the name of STMicroelectronics nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER + * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + ****************************************************************************** + */ + + +/* Includes ------------------------------------------------------------------*/ + +/* mbed specific header files. */ +#include "mbed.h" + +/* Helper header files. */ +#include "DevSPI.h" + +/* Components and expansion boards specific header files. */ +#include "x_nucleo_iks01a1.h" +#include "l6474_class.h" + + +/* Definitions ---------------------------------------------------------------*/ + +/* Absolute value of the threshold on the Y axis acceleration. */ +#define ACCELERATION_TH 50 + +/* Rotation gain. */ +#define ROTATION_SPEED_GAIN 20 + + +/* Variables -----------------------------------------------------------------*/ + +/* MEMS Expansion Board. */ +X_NUCLEO_IKS01A1 *x_nucleo_iks01a1; + +/* Motor Control Component. */ +L6474 *motor; + + +/* Main ----------------------------------------------------------------------*/ + +int main() +{ + /*----- Initialization. -----*/ + + /* Initializing I2C bus. */ + DevI2C dev_i2c(D14, D15); + + /* Initializing SPI bus. */ + DevSPI dev_spi(D11, D12, D13); + + /* Initializing MEMS Expansion Board. */ + x_nucleo_iks01a1 = X_NUCLEO_IKS01A1::Instance(&dev_i2c); + + /* Retrieving the accelerometer. */ + MotionSensor *accelerometer = x_nucleo_iks01a1->GetAccelerometer(); + int acceleration_axis = x_nucleo_iks01a1->gyro_lsm6ds3 == NULL ? 0 : 1; + + /* Initializing Motor Control Component. */ + motor = new L6474(D2, D8, D7, D9, D10, dev_spi); + if (motor->Init(NULL) != COMPONENT_OK) + return false; + + /* Set defaults. */ + motor->SetAcceleration(10000); + motor->SetDeceleration(10000); + motor->SetMinSpeed(100); + int status = 0; + int speed = 0; + + + /*----- Infinite Loop. -----*/ + + /* Printing to the console. */ + printf("Motor Control with MEMS\r\n\n"); + + /* Main Loop. */ + while(true) + { + /* Reading Accelerometer. */ + int accelerometer_data[3]; + accelerometer->Get_X_Axes(accelerometer_data); + + /* Motor Control. */ + int module = abs(accelerometer_data[acceleration_axis]); + if (module > ACCELERATION_TH) + { + int sign = accelerometer_data[acceleration_axis] < 0 ? -1 : 1; + speed = module * ROTATION_SPEED_GAIN; + + /* Requesting to run. */ + if (status != sign) + { + motor->Run(sign == -1 ? StepperMotor::BWD : StepperMotor::FWD); + status = sign; + } + + /* Setting Speed. */ + motor->SetMaxSpeed(speed); + + /* Printing to the console. */ + printf("Speed: %c%d\r\n", sign == -1 ? '-' : '+', motor->GetSpeed()); + } + else if (status != 0) + { + /* Requesting to stop. */ + motor->SoftStop(); + status = 0; + speed = 0; + + /* Printing to the console. */ + printf("Stop.\r\n"); + } + + /* Waiting. */ + wait_ms(50); + } +}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Thu Dec 03 12:17:33 2015 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/165afa46840b \ No newline at end of file