A few years ago LAVA was approached by a customer to develop a solution for utilizing an Android tablet as a low-cost controller along with several USB peripherals. Since then a number of LAVA products have been developed which rely on a feature found in certain Samsung tablets. While assisting a number of customers with their integration issues we’ve seen a reoccurring set of issues that keep coming up. Overall these issues can be grouped into one of two categories: Physical Issues; and Commercialization Issues.
Why does LAVA only support Samsung Tablets?
A few years ago LAVA was approached by a customer to develop a solution for utilizing an Android tablet as a low-cost controller, in conjunction with several USB peripherals. The project required that the tablet operates in USB Host mode with 24/7 functionality. This early product was the starting point for what would eventually become the LAVA STS-** family of devices.
There were several reasons for limiting the project only to Samsung tablets:
Continue reading “Using a Samsung Tablet for an enclosure – Part 2 of 3”
A few years back LAVA looked into the possibility of using an Android tablet as a low-cost control panel for a Thermostat control system with a series of network sensors. These discussions began after we were approached by a customer to develop a solution for a tablet-based loyalty system and as fate would have it, similar opportunities would present themselves a few months later.
A typical USB power supply is rated at 5 volts nominal and a capacity of 1 to 2 amperes. The supply voltage will not be exactly 5 volts, but will vary depending on load (hence the amount of current being drawn). The voltage must never exceed 5.25 volts.
A typical USB Power supply is rated at 10 watts (i.e., 2 amperes at 5 volts DC).
When plugged directly into a generic USB supply, a tablet (or mobile phone) might appear to charge very slowly. This problem is common even when the supply has an adequate current rating. This is generally because the power supply is not a DCP power supply.
Most mobile devices (including tablets) currently use built-in Lithium-ion rechargeable batteries. These batteries have a high energy density, minimal memory effect, and low self-discharge.
When using replaceable Lithium-ion batteries, only use a battery charger designed for this type of battery. Charging a Lithium-ion battery with the wrong charger can damage the battery, result in a fire, or cause the battery to explode.
This article discusses issues for all STS-** products, the TL002, and the STS OEM board.