SLC NAND: Secrets Exposed

Single Level Cell (SLC) NAND flash is no longer the stuff of headlines. Consumer markets are chasing the latest nodes and densities in Multi Level Cell (MLC), Tri-Level Cell (TLC), or the up and coming 3D NAND memories, leaving SLC NAND to the smaller “high reliability” market. However, in the world of embedded systems where product life cycles are measured in decades rather than years, SLC NAND is still in heavy use. Despite continued use in applications requiring long life or high-reliability solutions, NAND manufacturers have quietly made changes to their SLC NAND offerings that have slowly decreased the endurance of SLC NAND.
Continue reading “SLC NAND: Secrets Exposed”

Using node.js for Embedded Bathroom Occupied Reporting Over SMS

Abstract

The basis of this project is to provide a solution to any resource monitoring applications that involve sharing a limited resource for increased productivity or throughput optimizing. The solution involves use of a single board computer to monitor remote sensor nodes, manage a queue for any assets waiting to use the resource, and notifying the assets. This specific example is monitoring and managing a queue for use of company bathrooms and notifying employees when they become available. Employees can subscribe to the bathroom status using SMS text messaging and become alerted when it’s available and their next in the queue. The code, schematics, and documentation in this practical (and entertaining) example will allow for better time management of resources in a variety of serious applications (human resources, assembly lines, industry, etc.).

Continue reading “Using node.js for Embedded Bathroom Occupied Reporting Over SMS”

Real World Example in Working with I2C Sensor Device

Let’s take a look at what it takes to read sensor data from an I2C interface (aka I2C, IIC, TwoWire, TWI).  In particular, we’ll be reading data from the NXP MPL3115A2 Altimeter/Barometer/Temperature sensor.  The principles found in this guide can also be applied generically, even to your ambifacient lunar waneshaft positioning sensor of your turboencabulator.

Continue reading “Real World Example in Working with I2C Sensor Device”