Pedometer Click Board

The Pedometer Click Board™ is designed to be fairly simple to use. This Click board™ contains the STP201M module, made by NiceRF. The module itself is designed for wrist pedometer products, like the pedometer bracelet or watch for example. The end user doesn't have to worry about doing any calculations on their own, or worry about what the algorithm for step detection is doing, since the INT pins output is already a measurement of the steps that were taken. Before that, though, come the intricate parts of the design inside. First of all, the STP201M module, which is the main component of the Pedometer Click Board™, has a built in G sensor within the IC chipset.

How Does The Pedometer Click Board™ Work?

Specifically, a MEMS sensor. Micro-electro-mechanical system sensors, abbreviated to MEMS, are made out of very small components, with their size usually ranging from 1 to 100 micrometers. These account for the sensor being very small and therefore it having low energy consumption and also not requiring a lot of space. This particular sensor is a 3D one. The three axes it utilizes, allow for precise measurements of any movement and the direction its taking. The three axes system, along with the MCUs meticulous algorithm, make it significantly less likely to make any false-positive counts (ex. tying up shoes).

The MCU has two distinguished modes. The first one of them is the operational mode. The MCU is designed to go into the operational mode whenever it senses some activity. However, if there is no discernible movement over the course of 20 seconds, it goes into the sleep mode. This mode is characterized by the very low energy consumption of only 5 μA max. The STP201M modules communication is somewhat different from the standard I2C protocol. Since our libraries do not support it, the user has the capability of changing the code of the main MCU in order to fit the protocol of the module and thus change any preprogramed settings.

Since the modules maximum operatin voltage is 3.6V, the Pedometer click uses the 3.3V rail for power supply. The other pins it utilizes are the, before mentioned, Interrupt pin, and the I2C Clock and Data pins. This click also has a Power LED indicator.

The Pedometer Click Board™ is designed to be operated only with 3.3V logic level. A proper logic voltage level conversion should be performed before the Click board™ is used with MCUs with logic levels of 5V.

SPECIFICATIONS

PINOUT DIAGRAM

This table shows how the pinout of the Pedometer Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
NC	1	AN	PWM	16	NC
NC	2	RST	INT	15	INT	Interrupt
NC	3	CS	RX	14	NC
NC	4	SCK	TX	13	NC
NC	5	MISO	SCL	12	SCL	I2C Clock
NC	6	MOSI	SDA	11	SDA	I2C Data
Power Supply	3.3V	7	3.3V	5V	10	NC
Ground	GND	8	GND	GND	9	GND	Ground

ONBOARD SETTINGS AND INDICATORS