Startup companies centered the stage at a two-day demonstration organized at the Computer History Museum in Mountain View, California. Hardware technology was highlighted as 20 hardware inventions were featured accelerating ahead of the usual mobile app startup.

"This is definitely the most hardware companies we have had in a batch," Y Combinator President Sam Altman said in an interview by Silicon Valley Business Journal.

The Summer 2015 Demo Day was held at the Computer History Museum, California on August 18 and 19. Y Combinator conducts this event two times in a year to introduce startup projects; what it does, how it works and why it is substantial, cited on the Y Combinator website.

Among them are these three promising startup innovation:

Luna 

The innovators Andrea Ballarini, Matteo Franceschetti, Massimo Andreasi Bassi and Alexandra Zatarain called Luna as a Nest of sleep. It's a smart mattress that analyzes your quality of sleep, controls temperature on either bedside and wakes you up based on the alarm time you have set.   

A news from Tech Crunch said Luna sends data both to the app and other devices at home, which are connected to the Internet of Things.

At this time, Luna's total market is $27B, selling $1.4M worth of Luna mattress covers and signing a deal to distribute 6000 units. The startup is targeting $20M revenue in 2016.

GrowSumo

The startup was launched three weeks ago and had joined by 700 resellers. GrowSumo is a service that coordinates businesses and resellers. Their aim is to build a network that involves salespeople, connecting resellers to companies on a commission basis (3% goes to GrowSumo).

Companies of different sizes create a page on GrowSumo for the resellers to work with them, monitoring their sales progress. In turn, resellers can select from various companies with products they are interested in.

Call9

For 30 days, Call9 apps saved two lives, addressed 58 patients and had avoided 26 hospitalizations. Call9 will send ER doctors to the patient's home in a minute to grant medications. The company has a telemedicine line that concentrates on nursing homes. Recently, they have signed with 61 nursing homes on course to $30M profit.

Other remaining tech startups are lined with development tools, project management, finance, non-profits, customer service and e-commerce.