search

eclipse / upm

UPM is a high level repository that provides software drivers for a wide variety of commonly used sensors and actuators. These software drivers interact with the underlying hardware platform through calls to MRAA APIs.
MIT License
661 stars 410 forks source link

Intel XDK template of MCP9808 temperature sensor doesn't work with the Galileo Gen 2 #525

Open pache1211 opened 7 years ago

pache1211 commented 7 years ago

Hi I got these errors while running the MCP9808 template with the Galileo Gen 2:

MRAA Version: v1.5.1 ERROR: /home/root/.node_app_slot/server.js:19 ERROR: var temp = new mcp.MCP9808(6); ^

Error: Illegal arguments for construction of _exports_MCP9808 at Error (native) at Object. (/home/root/.node_app_slot/server.js:19:12) at Module._compile (module.js:409:26) at Object.Module._extensions..js (module.js:416:10) at Module.load (module.js:343:32) at Function.Module._load (module.js:300:12) at Function.Module.runMain (module.js:441:10) at startup (node.js:139:18) at node.js:968:3

Propanu commented 7 years ago

Hi @pache1211, the default (and only) I2C bus on the Galileo boards is bus 0. Thus your code needs to be changed to var temp = new mcp.MCP9808(0);.

pache1211 commented 7 years ago

Hi got the same error:

ERROR: /home/root/.node_app_slot/main.js:33 ERROR: var temp = new mcp.MCP9808(0); ^

Error: Illegal arguments for construction of _exports_MCP9808 at Error (native) at Object. (/home/root/.node_app_slot/main.js:33:12) at Module._compile (module.js:409:26) at Object.Module._extensions..js (module.js:416:10) at Module.load (module.js:343:32) at Function.Module._load (module.js:300:12) at Function.Module.runMain (module.js:441:10) at startup (node.js:139:18) at node.js:968:3

Propanu commented 7 years ago

Check with the vendor for your MCP9808 to find out the I2C address of the sensor. It's configurable through 3 address pins, and we assume a default of 0x18 (A2, A1, A0 grounded). If that's different in your case, say, you have the least significant A0 connected to VCC giving you address 0x19, you'll have to specify it when calling the constructor like so: var temp = new mcp.MCP9808(0, 0x19);

pache1211 commented 7 years ago

Thanks! I will try your suggestion.