View source for N-L15 preparations

==Reducing the sleep current==
*[https://developer.mbed.org/forum/mbed/topic/5863/ Nucleo L152RE power consumption in deepsleep and sleep]
<cpp>
// NIKOS: THIS WORKS REDUCING THE POWER DRASTICALLY
GPIO_InitTypeDef GPIO_InitStructure = {0};
GPIO_InitStructure.Pin = GPIO_PIN_All;
GPIO_InitStructure.Mode = GPIO_MODE_ANALOG;
GPIO_InitStructure.Pull = GPIO_NOPULL;
//HAL_GPIO_Init(GPIOA, &GPIO_InitStructure); 
//HAL_GPIO_Init(GPIOB, &GPIO_InitStructure);
HAL_GPIO_Init(GPIOC, &GPIO_InitStructure);
HAL_GPIO_Init(GPIOD, &GPIO_InitStructure);
HAL_GPIO_Init(GPIOH, &GPIO_InitStructure);
</cpp>

==Wake time==
wake time 17ms: [[File:n_node24_wake_time.JPG|400px]]

==uVision ST-LINK configuration==
No more need for manual reset for flash programming
[[File:ST-LINK_PREREST.JPG|400px]]


==32.768 KHz ==
*https://developer.mbed.org/questions/4531/RTC-External-Crystal-Nucleo/


==Redirect printf()==
<cpp>
Serial pc(PA_9, PA_10);      //N-L15 UART1 IS CONNECTED TO FTDI
</cpp>


==RTC==
*https://developer.mbed.org/users/kenjiArai/code/SetRTC/rev/3129de8d50ea


==sht21==
<pre>
1 Start Up Sensor
As a first step, the sensor is powered up to the chosen
supply voltage VDD (between 2.1V and 3.6V). After
power-up, the sensor needs at most 15ms, while SCL is
high, for reaching idle state, i.e. to be ready accepting
commands from the master (MCU). Current consumption
during start up is 350µA maximum. Whenever the sensor
is powered up, but not performing a measurement or
communicating, it is automatically in idle state (sleep
mode).
</pre>

==MAX44009==
Operational at 1uA

==BMP180==
*STANDBY:0.1uA
*ULTRALOW POWER: 3uA
*STANDARD MODE: 5uA
*PEAK (CONVERSION): 1000uA

==CURRENT JUMPER==
*In L-15 total current including n-node current
*In L152 n-node current bypasses the switch and the Jumper, so n-nodes current is not meassured




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