Battery-board-BMP085 is also based on our multipurpose Battery-board platform. This version includes a BMP085 dual pressure-temperature sensor made by Bosch and is able to measure pressures in the 300-1100 hPa (+9000 to -500 m above the sea level) range with a maximum resolution of 0.03 hPa (0.25m). This sensor also measures temperature from -40°C to 85°C with a ±2°C accuracy. Battery-board-BMP085 is perfect for measuring altitude and barometric pressure in weather monitoring applications.  Figure 1 : panStamp Battery-board-BMP085 for wireless applications If you are assembling this board by your own, remove R3, marked with the label "DHT 10K". Once assembled, you need to download Adafruit's BMP085 library for Arduino (thanks Adafruit team!). Then you will have to program a panStamp with our sample temphumpress application compiled with the TEMPPRESS definition enabled from sensor.h: /** * Type of sensor. Uncomment only one of these options: TEMP, TEMPHUM or * TEMPPRESS *///define TEMP 1 // Temperature sensor (TMP36)//#define TEMPHUM 1 // Temperature + Humidity sensor (DHT11 or DHT22)#define TEMPPRESS 1 // Temperature + Pressure sensor = BMP085By default, temphumpress takes Vcc as the actual battery voltage. However, all battery-boards have Analog 7 pin (panStamp 12th pin) directly connected to the battery. When using this application on a Battery-board, we advise enabling battery monitoring via the Analog 7 pin. From temphumpress.ino we have to uncomment the VOLT_SUPPLY_A7 definition: /** * Uncomment if you are reading Vcc from A7. All battery-boards do this */#define VOLT_SUPPLY_A7 Figure 2 : Base-board-BMP085 with panStamp and dipole antenna  Figure 3: Wiring diagram between BMP085 and panStamp Firmware-side, when programmed with our sample temphumpress application, the board periodically sends temperature/pressure readings according to the value programmed in the TX_INTERVAL register, saved in EEPROM. This interval is 255 (0xFF) by default in "fresh" panStamps so you will need to program your desired interval after programming the module for the first time. After transmitting the reading, the panStamp enters the sleep mode, disconnecting most peripherals until the next transmission and hence drastically reducing the current consumption.  Figure 4 : battery-board-bmp085 with wall-mountable enclosure (sold as an extra option from our webstore) |
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